[Facts] Re: Is there are more correct anglicization of Fionnlagh (Finley or Finlay)?
in reply to a message by Mike C
George Black says that the father of Macbeth was called Finnleikr in the Flateyjarbók, though that was most likely written in 1394, and is therefore not a contemporary source, and it probably just indicates that Norsemen interpreted the name in terms of name elements that they understood. Likewise, it may be the case that the -ley form arose by association with names such as Ashley.