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I think it's ok but as others have pointed out it seems very trendy. I like the sound though, but I would pronounce it Kay-ler not Kee-ler (which I don't like)
I think Keiler would be better as a middle name but if you want to use it as a first name I would use a more classic/traditional middle name like Keiler James or Keiler William (oh, I like that one).
I don't like the Keyler spelling at all.

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