Wiki mentions about the name Geno that it can be derived from a number of different names ending in "gino" including Luigino.
Who knows what his parents had in mind when they named him, or what the name on his birth certificate really is.
Geno may simply be his nickname, or maybe he legally changed his name to Geno, or his parents really did name him Geno.
Maybe it's short for Genius, or because he's related to a magical Genie?
That could explain why he likes to rub his hair so much, because it helps make his magical brain start working.
Derived | Eugenio, or names ending in "gino" such as Ambrogino, Luigino, and Giorgino |
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en.wikipedia.org