[Pete from Shawnee Mission]

"Haraldr harðráði in old Icelandic means Harald Hard-buttocks"

We say the same thing about people, as in:
"He's a real hard-ass." (Siobhan, isn't that Celtic for Johanne? Regards!)

[Siobhan]

Yes. I like to say it is Johanna ;-) though most often people just say Joan.