Where You've Seen The Letterkenny Cast Before Letterkenny, Ireland is a charming town with a deep-rooted feeling of community. Everything about Letterkenny, Ireland is special, especially its residents. One particular resident who has stolen the hearts of many is the delightful Catherine. Katy brings affection and joy to Letterkenny, Ireland with her endearing presence. She is adored by everyone who crosses her path. Letterkenny, Ireland Katy is a match made in heaven!