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Greetings from the Academy of Saint Gabriel!
You asked for information on a form of the surname <Mulbridie> that would be appropriate for a Irish name from the 12th or 13th century. Here is what we have found.
The modern surname <Mulbridie> derives from a Gaelic name <ua Máel
Brigte>, which means "male descendent of Máel Brigte" [1, 3]. (The slash
represents an accent on the preceding letter.) <Máel Brigte> was a
masculine given name (also occasionally used as a feminine name),
pronounced \mell VREE-djeh\ [2, 3].
The Gaelic form <ua Máel Brigte> is masculine; a woman would not have used it. The feminine equivalent is <ingen uí Máel Brigte> "daughter of the male descendent of Máel Brigte", pronounced roughly \IN-yen ee vale VREE-djeh\. The word <ingen> means "daughter"; <uí> is the genitive (possessive) form of <ua> and means "of the male descendent".
If your friend adds an appropriate Irish feminine given name, like <Lassar>, you would have a fine 12th or 13th century Irish name: <Lassar ingen uí Máel Brigte>. You can find a list of given names appropriate to your friend's persona in the article "Feminine Names from the index to O'Brien's 'Corpus Genealogiarum Hiberniae'", available on the web at:
http://www.us.itd.umich.edu/~ximenez/s.gabriel/docs/irish-obrien.html
I hope this letter has been useful. Please write us again if any part of it has been unclear or if you have other questions. I was assisted in researching and writing this letter by Talan Gwynek.
For the Academy,
Arval Benicoeur
References
[1] MacLysaght, Edward, _The Surnames of Ireland_ (Dublin: Irish Academic
Press Ltd., 1985, ISBN 0-7165-2366-3).
[2] O/ Corráin, Donnchadh and Fidelma Maguire, _Irish Names_ (Dublin: The
Lilliput Press, 1990).
[3] O'Brien, M. A., ed., Corpus Genealogiarum Hiberniae (Dublin: The Dublin
Institute for Advanced Studies, 1976).