Globally, Myslyn (Myslyn , Мыслин ) is an extremely rare girly first name. Much more frequently, Myslyn is the last name as well as the forename.
Мислин, מיסלין, מישלין, and ميسلين
Diega
, Мыслин 
) is an extremely rare girly first name. Much more frequently, Myslyn is the last name as well as the forename.