According to namenerds.com, the related name Arthfael is pronounced ARTH-vile (long "i" sound) and Mael is pronounced like the word "mile". That means Arthmael is pronounced ARTH-mile. It sounds like a combination of Arthur and Miles. :-)
My PNL is now rateable! (Top 25 for each gender):
http://www.behindthename.com/pnl/52996/85726Top rated:
Henry; Bottom rated:
Gerald and
Bertram