- Fluent speaker of Irish Gaelic.
- Born in Belfast, but raised in the Free State/"Republic of Ireland", and educated at the St. Louis Convent in County Monaghan.
- Interred in Rahoon Cemetery, Galway (Ireland), where a nearby road is named in her honor.
- Began her acting career in 1940 as a semi-professional at the Gaelic An Taibhdhearc Theatre in Galway. From 1944, frequently appeared in productions of the Abbey Theatre, and in 1947 made her London debut in "The White Steed".
- Had one son, Donnacha O'Dea, by her marriage to Denis O'Dea.
- Has a son, Donnacha O'Dea, who is a successful, professional poker player.
- Siobhan is pronounced "shi-vahn".
- Was twice nominated for Broadway's Tony Award as Best Actress (Dramatic): in 1956, for "The Chalk Garden," and in 1958, for "The Rope Dancers."
- Her Gaelic Irish birth name of Mac Cionnaith is McKenna in English, so her stage name is still her birth name.
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