Donnchadh
In Irish it's "Donnchadh"Although they are not connected, the old Irish name Donnchadh is considered "equivalent' to Denis. It Scotland it is anglicized as 'Duncan'.
In Irish it would look like "Donnchadh Seán".
They are Dennis Irwin, and Roy Keane.
It would be the same. Names are not 'translated' as such, many have 'equivalents' or 'substitutions' commonly accepted such as Seán for John or Donnchadh for Dennis in Irish.
Denis Irwin, former Irish football player: Cork, Ireland. Dennis(!) Irwin, American jazz double bassist: Birmingham, Alabama
John o'Shea, Roy Keane, Damien Duff, Dennis Irwin, Jeff Kenna, Roy Carrol
The Dennis families of County Cork may have been Ó Donnghusa who anglicized their surname.The English surname Dennis is first found in the records of Lancashire, after the Norman Conquest that began in 1066 A.D.The French version of this surname is first found in Champagne, where they'd held family seat since the most ancient of days.See the Related Link listed below for more information:
his name is Dennis Mitchell
Dennis is the scion of the Mitchell family.
Dennis's last name is "Mitchell".
Dennis in Hawaiian is DenekΔ.