what's name font on this letter(B)?
THANKKKKKKKSSS

it's a font.

Maybe ... but then ... maybe not. If it is, and again, maybe it is, it has been modified in such a way that finding a match is close to impossible for someone who doesn't know that (possible) font by heart. And we are all human and live by what we know

look this same 'B' in another logo
http://99designs.fr/logo-design/contests/create-boutique-chic-logo-fashion-forward-leather-accessories-372506/entries/183

Same