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I'd just think his parents liked the name. I know a black Hamish - 1000x more obviously Scottish than Somerled, and it doesn't seem out of place, it's just his name. (He's not Scottish at all) And Somerled is so unusual that I doubt anyone except namenerds is immediately going to guess its origin anyway.
Just seen kudriashkajo's suggestion of Solly/Sol - that works for me.:)