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She has a black belt in taekwondo.

Kiernan means 'Son of a lord'.

One of the youngest people to be interviewed on Inside the Actors Studio (1994).

She is said to bear a strong resemblance to Emma Watson. On one occasion, one of her Instagram followers commented a photo of hers with "So pretty Emma Watson". Kiernan couldn't help but respond with, "Thank you. I had an amazing time filming Harry Potter & am really thrilled about all the new projects I'm doing now".

Her fashion influences are Grace Kelly and Audrey Hepburn.

Her father is of one half Slovak and one quarter German descent, with his other ancestry being English, some Scottish, and distant French. Her mother is of three quarters Irish and one quarter Italian ancestry. Her surname is from her Slovak roots.

She was originally from Chicago, Illinois.