1) English girl name 2) English given name 3) Given name 
Jemma is an English name for girls. The meaning is `gem, jewel` The name Jemma is most commonly given to Scottish girls. (3 times more often than to American girls.) The name sounds like: Jemmy, Amma, Emma, Jamia, Jama, Jaima, Jemmie Similar names are: Jemsa, Jemima