Flaven (Flavins are welcome...)

There are very few Flaven surnames I've uncovered--many more, though, spelled Flavin. I assume there's a connection at some point in the past, but have failed to find it yet (possibly shortened from Flahaven). If you've uncovered any Flaven-to-Flavin or Flavin-to-Flaven link, I'd appreciate hearing about it....Thanks!
I discovered a cryptic note from my late mother's stash that indicates that the Flaven and Flavin surnames descended from the Irish Flaithheamh ("Lord")--also, thanks to Gerri (you know who you are), here are some additional spellings: O Flav zain' ain, O Flaghavane, O Flahevane, and O Flavane. If you've uncovered any specific links, please pass them on to me.

Family Tree Maker Reports and Trees

• Ross B Flaven -InterneTree