- Her professional name is a tribute to her late father Brian. She chose the name while at drama school, to avoid confusion with fellow Irish actress Aisling O'Sullivan.
- In 2014 she won a British Comedy Award for Best Female TV Comic.
- In 2012 she won Foster's "So You Think You're Funny?" at the Edinburgh Fringe festival.
- On 3 June 2024 she announced that she was expecting her first child. The birth was announced later that year, on 26 August. The father is her partner, musician Jack Freeman.
- Her first name is pronounced "Ashling".
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