She's really pretty I wouldn't be surprised if Namine's appearance is based off of Sora's Mom. And as for a name, I'm not sure if Sukai is her official name yet, but maybe Sakura.
(BTW, if you'd like, you should send this to Square Enix here's the address :
Square Enix, Inc.
P.O. Box 6000
Clear Lake MN 55319)