Martin Henry or
Martin Arthur work. :) Sibs
Michael Edward and
George perhaps? Okay, I'm biased. That's my grandpa, dad, and uncles. Anyway, I don't love
Martin, mainly because on the rare occasions when I say it, it sounds like Mart-NNN or Mar-TUN as opposed to Mar-TIN. Doesn't flow very well for me. But infinitely better than a lot of ones I've heard, so go for it!
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Neo