Within the UK and Ireland, the surname Gillen most frequently occurs in Ireland where it is carried by 1 in every 2,449 people. The majority of those with the family name of Gillen are to be found living in/around Ulster (approx. 32% of all UK Gillen's), Leinster and Connaught. The name can also be found in Scotland with 1 in 11,677 people using it, and England with 1 in 56,205.
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