That's what my baby book sez!
Greer Scot. Dim. Gregory (Lat. "Alert, watchful"). Given fame by actress Greer Garson, whose mother's maiden name it was.Grier
Gregoria (Fem. Gregory) Lat. "Alert, watchful."Gregoriana, Gregorijana, Gregorina, Gregorine, Gregorya, Gregoryna
"Gregorina" sounds Russian to me, and "Gregorijana" might be Persian influenced... I might have to operate a little on Georgina!
For a laugh, the closest my book gives for the masculine form of "Rose" is "Roswell," meaning "Rose spring"!