The word seems to have been treated as a name in virtually all the versions, including local ones.
The name 'Coyle' is common in the Armagh/Monaghan area and turns up regularly in connection with sporting activities, if you can describe the persecution and killing of animals as 'sport' - (sorry - had a traumatic experience as a teenager at a 'sporting' event at Waterloo, Merseyside, where I witnessed a crowd cheering on two dogs who were tearing a live hare in half - 'shuffling off its mortal coil' so to speak).
Jim Carroll