I came up with 2 possibilities:
1. In one episode of "The Adventures of Sonic the Hedgehog," Sonic says: "That's Hedgehog. Sonic the Hedgehog." Although this is just supposed to be making fun of the James Bond series, it could actually be...
2. In "The Adventures of Sonic the Hedgehog," Sonic calls Tails his "little bro." Since all brothers have the same last name, and Tails' last name is "Prower," that could also be Sonic's last name.
Okay, Sonic's last name is actually Hedgehog.
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Sonic the Hedgehog's middle name is Maurice.
Fire and sonics. Sonics to a lesser degree then Venom
Beacuse ppeople want them to be differnt.
it is reveled in episode 065 of the tv series, that his real name is "Humphrey Rosendorf"
Sonic's fathers' name, according to the Archie series of comic books, is Jules Hedgehog.