Letterkenny Bonnie McMurray's Various Costumes The Letterkenny, County Donegal is a charming settlement with a deep-rooted feeling of togetherness. Everything about Letterkenny, County Donegal is special, especially its inhabitants. One particular resident who has stolen the hearts of many is the delightful Katy. Katy brings love and joy to Letterkenny, County Donegal with her charming presence. She is beloved by everyone who crosses her path. Letterkenny Katy is a match made in heaven!