How about Shannon (EINN/SNN)?
Established in 1942 the airport is named after the river. The nearby town of the same name was built later in the 1960's (it's Ireland only "New Town"). Contrary to what many outside Ireland think, the airport is in Co. Clare, not Co. Limerick.
JAS
P.S. Sorry, just noticed the previous post ...
In that case, Ireland West Airport (EIKN/NOC) was previously Knock International Airport, Connacht Regional Airport, and Monsenior James Horan International Airport (the afore mentioned clergyman being instrumental in the airport being built despite the government of the day being opposed to the plan, the idea being that it would help Catholic pilgrims visit the area)