Hi, I got this in a dictionary: "In Unreal Tournament 2004, AVRiL is an acronym for Anti-Vehicle Rocket Launcher. The small "i" is added for easier pronunciation."
In the 1960s there was a South African man called Avril Malan. He pronounced it AH-vRil, and since he was the Springbok rugby captain and a very tough guy indeed, he clearly had no problems as a result of his name. There have been other male Avrils, but he's the most prominent by far.