Orla is a very nice name, and it's very cool and smart to use a 4 letter shortened version of a longer name. Several great examples...Mike for Michael, Rich for Richard, Alex for Alexandra, Dave for David
Also there are very cool 4 letter first names like, Lisa, Lynn, Meav,
. Plus, some people might try to use the 'g' sound if its Orlagh and mess up the pronunciation. I would guess that most people say Orla in a correct way.