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Oh, gee, how on earth can you tell the difference between FAY-lim and FAIL-im in normal speech? Very few people are going to make enough of a separation between the two syllables for this to be an issue. For the huge majority of people, these ARE the same pronunciation, and so they "come from" the same place.

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So I'm sure both are "acceptable", though if you want validation for the way your prefer, that's how the name is divided in the pronunciation guide in Irish Names by Donnchadh OCorrain & Fidelma Maguire.