[QUOTE=Colophon]
[Quote=Eyebrows 0f Doom]
I am not sure on Duibhdhiormaigh, but my guess would be duv-yor-ma.
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I may be wrong, but I think the “ui” and “io” diphthongs are both pronounced as a short “i”, and “aigh” at the word end is either “-ee” or “-uh”
So I’d read it more like “Div-jir-mee”. We need an Irish speaker though…
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Between the two of you, I think you’re getting warm. I don’t know the language either, so until a real Irish speaker (preferably one familiar with the pre-reform orthography) shows up to enlighten us, I got out an Irish dictionary which gives IPA phonetic renderings. The pieces of this name found in there may give some clue.
Duibhe ‘blackness, darkness, gloom’ is pronounced approximately DIV-yuh.
Diorma ‘band, troop, detachment’ is pronounced even more approximately DYEER-muh or DJEER-muh. Not sure what this has to do with the name Diarmaid, but that name is the source of the Anglicized spelling Dermot, as you noted.
However–this part exhibits lenition, as shown by the change of d > dh. Note that the d is “slender” because it’s followed by i. Lenition of slender dh- sounds like “y.”
And according to Irish_orthography the final -maigh would be pronounced “mee.”
So the best educated guess I can come up with is div-yeer-mee.
The distinction between “broad” and “slender” consonants is important in Irish phonology. Consonant quality is affected by neighboring vowels: a, o, and u are broad, while e and i are slender. That’s what a lot of the seemingly extraneous vowels are for: they show when a consonant is pronounced broad when next to a slender vowel, or vice versa. For example, the name Seán is written with two vowels, but has only one actual vowel sound. The broad vowel á would make for a broad s in front of it–but the slender “sh” sound is indicated by inserting the slender -e- in between. The accent mark always tells you which vowel gets actually pronounced.