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Greetings,
Here's the information we found on the names "Ulliam," "Declan," "Bran," and "Neil," which you wanted to use as Irish names. We took this information from "Irish Names" by O'Corrain and Maguire.
The name "Uilliam" (with another i) is a fairly popular Irish name in later period (the name was introduced by Normans who first settled in Ireland in the 13th century). It was pronounced just like the English name William.
"Declan" was the name of a saint. The name is popular in modern Ireland but it wasn't used very much until fairly recently. It's plausible, but not that likely. It is pronounced "DEG-lahn" with the accent on the first syllable.
"Bran" is a popular name in early period and has been used continuously until the present day. In later period it was associated with the O'Byrne family. It's pronounced "BRAHN."
"Niall" (the Irish spelling) is one of the most popular Irish names. It would be appropriate for any period. It's pronounced "NEE-ahl."
The Irish equivalent of "James" is "Séamus" (pronounced "SHAY-mus") or Siacas (pronounced "SHAH-kas"). The latter is derived from Jacques. Both these names were first used in the 13th century.
Any one of these names (except Declan) would be accurate for an Irish man who lived after 1200. Multiple given names weren't used in Ireland until modern times, so it wouldn't be accurate to use more than one of them.
If you would like assistance in forming the rest of your name, we would be happy to help you. We hope this has been helpful, and that we can continue to assist you.
In service,
Alan Fairfax
Academy of S. Gabriel