Keriman (together with simply Kerima) seems to be a Turkish variant of the Arabic name
Karima, which is in the database.
Confirmation, of sorts, gave me the Google Translate output of this page on a Turkish "baby names" website:
http://www.bebek.com/isim_bankasi/keriman/1900
The (translated) meaning given there is "generous, great", which is also the meaning of
Karim /
Karima.
Rene www.BabyNames.ch