The name Iolanthe is a girl's name of French, Greek origin meaning "violet flower". Iolanthe and is often added to lists like Color Names for Babies and discussed in our forums with posts like "Baby a Day".
From the experts:
Iolanthe is known primarily through the1882 Gilbert & Sullivan operetta of that name, in which the title character is a fairy. Iolanthe is a softer version of Yolanda, and is the kind of multi-syllabic classical name once considered too weighty for a modern baby girl, but now within the realm of possibility--this one as a dramatic twist on Violet