- He has Norse-Gaelic roots and is a descendant of the Hiberno-Norse King Óttar of Dublin, a prominent figure who ruled from 1142 to 1148 during a brief resurgence of Norse influence in the city amid ongoing struggles with Irish dynasties and rival Norse claimants.
- In one of his first acting jobs, he worked with Robert De Niro.
- He was born in Dublin, Ireland.
- Cotter's father was Sir Patrick Cotter, the 7th Baronet of Rockforest.
- He was educated at Allhallows College and the University of East London.
- In 2023 Cotter succeeded his father as the 8th Baronet of Rockforest, County Cork.
- Originally planned to pursue a profession in the art world after graduating from the University of East London, before becoming interested in acting.
- Speaks fluent Castillian Spanish.
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