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Greetings,
Here's the information we found on your Irish name.
Any of the first names you mentioned would be appropriate for early Ireland. O'Corrain and Maguire is a standard SCA source for Irish names. "Early" according to their definition is very early, but we were able to find a few examples of all the names you mentioned in the 10th and 11th centuries. (1)
Of the spellings for "Flatley" that you found, the oldest ("O'Flaithfhileadh") dates only to the late medieval period. We have evidence that the name was used in the 11th century, although we don't have an example of how it was spelled. (2) However, based on other names from the same period, we recommend the spelling "ua Flaithfhiled."
A name like "Ségán ua Flaithfhiled" would be appropriate for the 11th century. Make sure to check the correct pronunciation of whatever name you pick, since Irish and English have very different spelling rules.
You mentioned that you wanted to use a hawk in your arms. Heraldry came into use during the 12th century, so your persona wouldn't have used heraldry at all. However, many people with personas who wouldn't have used arms do register arms in the SCA.
Although many people based their arms on their surnames, we have no examples of people who based their arms on their given names. As far as we can tell, it was't done. This doesn't mean that you can't use a hawk in your arms, but from a medieval point of view there's no particular reason why you would.
Arval Benicoeur, Talan Gwynek, Effric neyn Kenyeoch vc Ralte, and Tangwystl verch Morgant Glasvryn contributed to this letter.
We hope this has been helpful, and that we can continue to assist you.
In service,
Alan Fairfax
Academy of S. Gabriel