Thank you both very much! You've been extremely helpful.
On a related note, could you tell me if Seanan—without the little á—can have the emphasis on the the first syllable? For example, can it be "SHAN-an" or does it have to be "shan-AN"? I'm sorry if you've already answered this, but I
Oh, and Penquiny7—I definitely would be going with
Senan rather than Senán, or
Seanan rather than Seanán for this character.
He is intended to be of mostly Irish descent, but for nearly all intensive purposes American, so the Anglicised version would make more sense.
Thank you again!