I originally had a male character called Haprimac. I'm a big LotR fan and Meriadoc Brandybuck was one of my favourite characters. I wanted to make a hobbit-like name that would work the same way (Meriadoc -> Merry, Haprimac -> Happy), but when I made another character (a female seawolf roegadyn) in beta, I changed Haprimac to go with the guidelines. It also fits in the sense that the -ilona part of Haprilona is a Finnish girl's name that means "joy".

So if I translate Haprilona Sunnwyn, it'd be "Gatherer of Happiness, daughter of Sun".