For those who catalog variant names of cryptids, I was recently informed by cryptozoologist Garry Cunningham that another name in the Irish language for the dobharchú is cú bán. This literally means "white hound" and there may be some confusion here, as sometimes the term dobharchú has been applied to an albino otter.
The term dobharchú has also been used to mean an otter generally.
It is pronounced either dovarchoo or doorchoo with the ch sounded as in Bach.
A variant meaning simply "otter" is the word dobhrán (doorawn)
while an early Irish-English dictionary by Peter O'Connell (manuscript in the Library of Trinity College, Dublin) gives dobhrán boisleathan for beaver, an animal not found in Ireland.