The Ireland based Irish Independent newspaper has an article tracing the roots of Hollywood celebrities. Listed amost the actors with an Irish heritage is Lucy.

Uncovering Hollywood?s secret Irish heritage
Irish Independent 27 December 2011

While some celebrities find it difficult to hide their Irish heritage behind their red hair and freckles, the Celtic ancestry of others, like George Clooney, is a little harder to hone in on. Indeed, it is surprising how many un-irish celebrities actually have Irish roots.

Xena: Warrior Princess

Lucy Lawless, who played the sexy and strong warrior in the hit TV show, may be the most famous actress from New Zealand to ever swing a sword, but she is also the daughter of the unmistakably Irish couple Frank and Julie Ryan.