1. I like some and I don't like some. I think some are fad-ish (like Mackenzie) and some aren't (like Fiona) - it all really depends on the name. If you choose something less common, then it won't seem like following a trend; but if you choose something more common, it doesn't matter what your heritage is because plenty of non-Irish are using it.
2. Some I like are Fiona, Bridget, Bedelia, Finola, Finley, Lachlan, Alastar, Declan, Aoife, Maeve. I probably like more, but I don't really think about the origin of a name, unless it's my own (Dutch mainly).