Likely a French-style form related to Angelina or a surname use, with uncertain exact etymology.
Geline is likely a French-style form related to Angelina or to surname usage, though its exact etymology is uncertain. That uncertainty gives the name a softly elusive quality. It sounds polished and continental, with a little of the refinement associated with French naming, but without a fixed historical story.
The result is a name that feels elegant by sound alone. As a rare modern form, Geline has a smooth, understated femininity. It sits comfortably among names that feel romantic without becoming elaborate.
The name’s ambiguity can be part of its appeal, because it allows it to seem both familiar and slightly mysterious. Geline feels graceful, light, and composed, with a modern softness that does not depend on being overdefined.