- He is of Norse-Gaelic descent, and is an ancestor of the Hiberno-Norse King, Óttar of Dublin, who was King of Dublin from 1142 - 1148.
- 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.
- Worked in the Michael Parkin Fine Art gallery and then as an Assistant Director before becoming an actor.
- 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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