I'm just not crazy about
Alexis at all -- for a boy or a girl. It sounds sort of pretentious, sort of like a taxonomic category, and sort of like the phrase "a
Lexus." I just vastly prefer
Alexander or
Alexandra, either way with the nn
Alex. I know you're not in the US, but here
Alexis is definitely used as a girls' name and would sound feminine on a boy.