There is no particular Spanish name associated with the Irish name Brianna.
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All personal names - such as Brianna - are said and spelled exactly as the person with that name says and spells them, regardless of which language they're speaking.
When you say your name in your own language, it will usually sound different from the way someone speaking another language will say it. Certain letters and letter-combinations are used quite differently between languages, and combinations in one language can be nearly unpronounceable by speakers of another language: the English 'st-' sound, as in 'Steve' for instance, can be very difficult for speakers of some Asian languages to say, while many English speakers have trouble with the Spanish 'z', and so on.
Some given names have direct equivalents in other languages: the Spanish José or Miguel match the English Joseph or Michael, for example. Some people prefer to use a local equivalent of their given name when with speakers of another language; some alter the spelling to avoid confusion, and others simply stick with their own native version or pronunciation: it's simply a matter of personal preference and practical considerations.
Even where no equivalent exists, as with Brianna, local pronunciations can render the name nearly unrecognizable to its owner. Interestingly, the name Brianna derives from the English male name, Brian, which I don't believe has an equivalent in Spanish, and many Spanish-speaking people will pronounce Brian 'Bree-ann', 'Bree-yan' or 'Bray-ann - much closer to the English style of Brianna than Brianna is, in English, to Brian.
bray e in spanish has an a sound like a in English
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Bree Condon's birth name is Bree Condon.
"Emilina" is a Spanish name. It pronounced "ay-me-LEE-nah". Please see the Related link below for confirmation of the translation.
Bree Luck's birth name is Bree Patrick Hodnett.
Bree Turner's birth name is Bree Nicole Turner.
Bree Nogueira's birth name is Nogueira, Bree Lynn.
Bree Miller's birth name is Bree Ann Miller.
Bree Michael Warner's birth name is Bree Danielle Aquilia.
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Bree Bumatai's birth name is Karen Brilliande.
Bree Daniels's birth name is Breanne Boland.
Maudy van Bree's birth name is Antonia.