Hello,

I am looking to translate my last name O'Sullivan (in Irish, Ó Súilleabháin) and the family motto "Lamh foistenach abú" into the Ogham alphabet for a tattoo. I'm not quite sure what the most accurate way to transliterate from the Latin-alphabet version of Irish to Ogham would be, since there are a few different alphabet charts online (and I'm not sure if a direct matching of the Latin characters to Ogham would be most accurate to the Irish pronunciation, though perhaps it's that simple). The version of Ogham detailed here (https://ogham.co/ogham-alphabet/) seems to be the most common. I'd very much appreciate any advice on the best way to transliterate these words into the vowels and consonants available in the Ogham alphabet in a way that's accurate to the Irish pronunciation, before I get it written permanently

Thanks!

If you look on that page you provided, the first on the left under Ogham.co is Ogham Transliterator. Click on that an there is a space to paste in Ó Súileabháin (one "l" by the way) and it will give you a rendering.
That said, I'm not sure if Ó Súileabháin would have been spelled that way back then so what you are asking is to put Ogham letters to a modern word. If that's OK with you, go for it as long as you understand that. The name originates from "Súil-dubhán" as explained here: https://www.libraryireland.com/names/os ... abhain.php Also, the Old Irish form for "Ó" was "Úa" so you might think about changing that as well.

Wait for more input and comments on this.

Tim

The language originally written in Ogham was not Old Irish but Archaic Irish, still three or four hundred years older than Old Irish.
It was a very different language still much more alike Protoceltic.

So, then Ó Súil(l)eabháin* could probably had been:

AVIOS SULIDUBAGNI
https://ogham.co/?q=Avios%20Sulidubagni


*) Both spellings are in use and although Irish Names and Surnames regard -l- as more correct I think the change of -ld- in Súil-dubhán to -ll- in Súilleabhán very natural.

True. Both are in use. As for it being very natural, that would be your opinion. I wouldn't have guessed that either way.

Thanks for the lesson in Archaic Irish.