Hmm. They definitely say
Regan in the Aussie version.
Come to think of it I don't think I've ever seen it written down. *checks McLeod's Daughters site* They spell it
Regan there (ep 119 on this page
http://mcleodsdaughters.ninemsn.com.au/episodes/index.aspx?subsectionid=1725) Maybe it's a dialectal thing.