I could have SWORN that Meryl meant/could also mean "black bird" - I'm assuming as a feminine variation of Merle. See also: http://www.behindthename.com/name/merle
― Anonymous User 11/30/2008
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This is actually the Welsh spelling, it's not an English name except for people of Welsh extraction. Baby books define it the same way you have done for MUIRGHEAL, so I imagine it's the Welsh version of the Irish name.