Orla is an Irish name closely associated with the high king Brian Boru, as it was the name of his sister, daughter and niece. It was very popular in the Middle Ages-- the fourth most popular name in twelfth century Ireland-- and has become popular again in Ireland (ranking Number 74) and Scotland (36) today.
In Irish, the name is Orlaith.
There is a student at Hogwarts School named Orla Quirk in the Harry Potterbooks.
An authentic Irish name with a lovely meaning and no pronunciation problems.