Ok,
Yumi is officially crossed off. It came to my realization that it just doesn't go a well with the surname or roll off the tongue. Someone had mentioned that it sounds like "you me" as in the English words or someone saying "yummy" in a strange way
I'm definitely going with Yuna (Sero & Yuna) not sure to give her another sister. Hmm. Perhaps 1 sister and 1 brother or 2 sisters and 1 brother. Still pondering
At leas I got one down! (: