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 "Names on NB that make you go WOW!".
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