He's studying - L'ap etidye.
Bless him (as in God bless him) → Bondye beni li.
Bless him (as in God bless him) → Bondye beni li.
If you mean "Willie" as a proper name...Then it's the same in Creole
If you mean "willie" as a "nickname" for the male genital organ... It's "yoyo" or "gigit"