Blend of Geraldine (Germanic, spear ruler) and Caroline (free woman), a mid-century coinage.
Geroline is a blend of Geraldine and Caroline, a kind of mid-century coinage that joins Germanic and Romance elements into one feminine form. That mixed origin gives the name a well-groomed, almost tailored quality.
It sounds like a name created to feel both established and fresh, which is often a hallmark of the era that produced such blends. The name has a vintage polish that can feel elegant without being fussy. Geroline suggests continuity with classic feminine names, but it does so through combination rather than inheritance.
That makes it distinctively modern in construction even when it carries old-fashioned charm. It has the sort of balanced sound that can read as graceful, settled, and slightly formal, with an easy mid-century brightness.