There are Saturnin Farandoul, Mowgli, Tarzan, Paw and Bomba clones of a worthy note. Whereas Souji Yamakawa actually saw "Tarzan of the apes" starring Elmo Lincoln, which was released in Japan in 1918, others didn't watch and read about the character at all, just creating other character clones.
Saturnin Farandoul possibly has the fewest clones due to the fact that both Mowgli and Tarzan, as well as Bomba, are far more popular choices than him.
John Arthur Livingstone - Apart From Kenzo Masaoka’s feral boys raised by Monkeys and Squids, Possibly the only direct Saturnin Farandoul clone on record. Raised by a community of misplaced apes on a jungled island. He is Inspired by Taku Horie’s Shonen Harimau, Shishio and Kazuo Fukuyama’s Jungle Kid, as well as Ejim from the Tombiruo books.
Hictaner - A minor but significant French pulp character,
Hictaner inspired his more famous Russian expy Ichthyander and, in terms of his design’s colour, the latter’s own much more famous successor DevilMan.
The titular character of the Island of Regeneration - this character himself inspired Ichthyader, Kroom, Dolphin Boy and Mar (also called Tamar).
Monkey Boy - Monkey Boy is a boy raised by Monkeys. He himself inspired the protagonist of the Panther’s Fangs manga by Mitsuo Higashiura and the two protagonists of the Kamishibai plays ‘Cry of the Beast’ and ‘Shonen Taro’.
Squid Boy - Squid Boy is the adoptive brother of Monkey Boy. He Mara the Island Princess and many others, including Yutaka Yoshida’s own Wolf Boy, the rather disparate basis for Toei’s Wolf Boy Ken.
Polaris is possibly a prototype Tarzan clone himself, appearing only a year after Tarzan of the Apes was published. He spawned imitators named Kioga, who lives with Native Alaskans in the Northwest of Alaska, Shasta, who is raised by wolves in the Pacific Northwest wilderness, Tarsa, who was raised by bears in a northern Scandinavian forest instead of being completely isolated (but is more of a Popeye expy, mind you), Ozar who was raised by the Aztecs, and Zagor, who rules the forest of Connecticut.
Tarzan clones are among the most common of all.
Shonen Champion Shingo - Shingo is a Tarzan clone raised by gorillas. Definitely the first major true Tarzan clone ever created outside of America. He spawned imitators like Tarna, Zomba, Kinki, Tambu, Banto, Jungle Champ, King Somai, Karzak and Shonen Congo.
Orzowei - Orzowei is basically the Male counterpart of Sheena, but in South Africa. He inspired Hyo (Damon) in Wild Damon.
Simba Bwana - Bwana Simba is the companion to Jungla, also known as having a brother named Kiwi in Italy or Tiki in France. Unlike most Tarzan clones, it is clear that whilst he appeared in family comics like his predecessor, his older sister Jungla appeared in adult comics.
Kaspa - Kaspa the Lion man is Tarzan’s Blonde British equivalent raised by lions. He spawned imitators like Tarzaneta, Kwa, Camilla, Durga Rani, Saari, Zegra and Shuna.
Nanuk - Nanuk is the first known Tarzan clone in the Spanish speaking world. He spawned imitators like Zorro of the Jungle and his competitor Kal, Tirza, Lovarzan, Tibor, Mowg, Zago and the original Hispanic Lion Man.
Anelope Boy - Susumu Egawa and Toraichi Suma's own character is rather interestingly raised by antelopes.
Sheena - Sheena was the first major comic book heroine. She also inspired a slew of jungle girls as well as two tv shows and a film.
Ultus - Ultus is the first major Tarzan clone in the Hispanophone world. He spawned a more famous imitator named Akim, as well as the lesser known Yarmak and Jon of the Jungle.
Shonen Baboon - Baboon boy was interestingly the equivalent of Shingo and the gang in East Africa, as he himself is somewhat inspired by The Jungle Goddess, a girl raised by jackals, and Lord of the Leopards by F. A. M. Webster.
Ki Gor - Ki Gor is the blonde equivalent of Tarzan who was raised primarily by elephants. He influenced Zago, Yarmak, Tamulah and Zanthar.
Kaanga - Kaanga is Ki Gor's comic book equivalent. He spawned many imitators like San Dar, Tamar, Zago, Azan, Konga, Tambu, Princess Vishnu, Bombo and Jungle Jo.
Silac - Silac is a Tarzan clone whose companions are lions. He himself inspired the Jungle Falcon (Oerwoudvalk), Red John (ROOI Jan), and the Black Leopard (Swart Luiperd), all South African pulp icons.
Rulah - Rulah is unusual in that she got stranded in the Nile Valley. She inspired an imitator named Jungle Lil.
Baruuba - Baruuba is a Tarzan clone who is not just biracial, but also raised by lions and chimps. Baruuba spawned an early imitator, Jungle Boy King Ken (aka the prototype for Wolf Boy Ken) from Kobunsha, best known as the publisher of Astro Boy, and Tatsuomi Yamauchi's Jungle Angel.
Shonen Kenya Wataru - Wataru is unusual among Tarzan clones in which he was stranded in Kenya as a preteen. His companion (genre and title wise anyway) is the Baboon Boy and more commonly Kate O'Connell.
Anjani - Tarzan's British clone who was raised by a tribe.
Taburay - Mexican Tarzan clone created by Beiker and Leopoldo Zea Salas.
Gogu - Created by Adrian Luky.
Buruuba - Buruuba is Baruuba's film equivalent. He inspired Barú, a Mexican film character and Kyuuta Ishikawa’s own Shōnen Buruuba.
Zamba - The name of both Mr Kyuuta Ishikawa's and Wasuke Abe’s much lesser known creations. The former’s is actually Brooba as a teenager, even though his other inspiration is also the first Zamba Kun.
An - Mitsuteru Yokoyama's only Tarzan inspired creation.
Asai Sau - The female equivalent of Baruuba. She is inspired by Brazil’s Morena Flor and South Africa’s Tamar, plus Britain’s Zanna and Torama.
Mowgli and Toomai clones are so called because of Asia’s diverse geography. Although not as prominent as Tarzan clones, Mowgli and Toomai clones are mostly characters with different roles.
Nanga - Nanga is the first known Mowgli clone. He appeared in Jungle Born by John Seymour Eyton.
Hari - Hari Is the first Mowgli clone created by a Southern Asian, who was also an Indian! He himself inspired Hathoo of the Elephants and Jong Jin Lee/Yi’s Wang Guru.
Kulafu - Kulafu was the first Mowgli clone of the Philippines. He inspired Hirro, Talahib, Dumagit and most famously Hagibis. Like Tarzan and later Hagibis, Kulafu has a wife and a son.
Saro - Saro appears in the jungle book tv series by Magic Video. He is himself inspired by Sam of the Jungle and Roy Tiger the Jungle Boy.
Kore - Mexican Tarzan and Mowgli clone created by Alfonso Tirado.
Mawa - Though raised In the Amazon, She is more of a Mowgli clone than most Bomba clones are.
Tam - Tam is the world’s first Major Mowgli clone. He inspired and spawned imitators named Raani from Prince of the Jungle, Sangroo, Rani De Los Tigres, Nyla, Kim, Tajo and Shekkai.
Shonen Tiger - Shonen Tiger is definitely the world's first major true Mowgli clone outside of America (he's created in 1932), though the character (or at least a later character inspired by the original) didn't see the light of the mainstream until being transformed into an emonogatari series in the later part of the 1950s. Shonen Tiger is raised by a big tigress called the Queen of Asia and plays an active role in the Great Plains and mountainous areas of Asia. There was a beautiful girl called Kana, a white skeleton demon named White Skull with a golden bat-like appearance, and the Devil "Godem Roccon, Roccon Godem" as a main enemy, and Black Satan, who appears with a mysterious snake as his beloved pet.
Sorak - Sorak is Mowgli’s Malaysian equivalent.
Sandor - Sandor is notable for being the first major true Mowgli clone in the Anglophone comics. Though little known today, he competed with and spawned a lot of foreign imitators with different roles like Kazanda, Bantan (likely mixed European-Polynesian), Bengala (has English immigrant parents but is Indian born), Wambi (most likely a northeast Indian), Sahib Tigre (likely a mixed race Anglo Indian) and Kali Kriss.
Taj - Taj is the first Mowgli clone who isn’t fair skinned. She influenced a longer lasting imitator named Tarou, who is also biracial but Malaysian born.
La Tigre Bianca - La Tigre Bianca is definitely the first major female Mowgli clone, even though she had Irish parents. Her companion was Rikki.
Wiro - Wiro spawned imitators like Waro, Tiwi, Zanga, Gogo, Cempaka, Jakawana (likely Peranakan Indonesian), Yimbo, Mala and Kali Kriss plus Marimba. He is most likely a mixed chinese-Batak, but has also been acknowledged as the first Tarzan clone to be a fanboy of Tarzan himself.
Shonen Wolf - Wolf Boy is one of the Japanese Mowgli clones. His companion is Sonia Jones.
Dumagit - Dumagit is A Mowgli Clone inspired by Nanga of Jungle Born and Carlos Roume’s Sabú.
Nizar - Nizar is a blonde Mowgli clone whose companion is a tiger. He is inspired by Sōji Yamakawa’s Tiger Boy.
Ken - Perhaps the most notable Mowgli clone ever created, though the misplaced cultures and wildlife aren’t much of a deal because his show is a fantasy comedy series.
Gora Gopal - Gora Gopal is notable for being the blonde masculine equivalent of La Tigre Bianca. He himself inspired Toto from Toto’s World and the Prince of Wolf’s titular character.
Takina - Takina is a Mowgli clone appearing in the mockbuster Jungle Boy. He’s actually a rebadged BaRuuba though, but his backstory is much lighter and softer than in the original BaRuuba no Bōken books.
Iyawadee - This is the female equivalent of Mowgli, raised by orangutans instead of wolves. She is somewhat influenced by Krishna from a live action film called Jungle Boy, not to be confused with the Good Times cartoon.
Fathiyah - Iyawadee’s Indonesian equivalent, actually the nickname of at least three jungle girls, all played by a single actress.
Paw and Bomba clones are of the more obscure variety.
Jan - Jan of the Jungle is not just a Tarzan or Bomba clone, but a subversion too. Instead of the parents being dead, they do not remember him at all. He spawned imitators like Tukano, Banga, Jaragu, Congo Jack, Okara, the first Ka ZAR, and Charka.
Jukan - Jukan is Scandinavia's gritty blonde equivalent of Bomba. He inspired Ruthie O’Rourke and in turn is inspired by Torry Gredsted’s Paw.
Shonen Zamba - Shonen Zamba is set initially in Mato Grosso, though misplaced wildlife and cultures aren't much of a deal, as this is likely a Kazuyoshi ‘Wasuke’ Abe comic which did blend a couple of cultures because Brazil is itself a multicultural country.
Yataca - Yataca is France's equivalent of Bomba, though he was born to and raised by his geologist parents in South America instead of being not remembered by them. He then moved to Africa as well.
Kio - A Chilean Bomba Clone who lives in the Amazon. His contemporary is Tumac and his expy is Shu Hagiwara of the Nice Barbarian (ステキに野蛮人) manga by Kazuyoshi ‘Wayu’ Suzumiya.