[@Orange Juice] Your character's last name should not be Odinson.

Following Asgardian naming conventions, your character's last name would be Thorsdottir.

Odin's last name is Borson because his father's first name is Bor and Odin is a son.

Thor's last name is Odinson because his father's first name is Odin and Thor is a son.

Aldrif's (Thor's half-sister) last name is Odinsdottir because her father's name is Odin and Aldrif is a daughter.