" 
 ::I agree with you.  Alphabetical seems the most sensible, and the easiest to follow and implement.  As to Mischa Barton - I'm not familair with her, but I gather from the article that she was born in the UK to an English father and Irish mother and moved the US when she was four.  You mentioned ""naturalized US citizen"", but I don't see that in the article.  Is she a US citizen?  If she is active in the Irish-American community, or plays up the Irish part of her heritage, then I'd say ""yes"", otherwise I'd say ""no"". 50% Irish heritage is enough to make her Irish-American in the conversational sense of the word, but not enough to bother tagging her with the category, IMO. \ "