Dia Duit,
I was hoping someone could provide me with the Irish word for Shepherd, my last name. I have but a sliver of British in me, and it happened to become my name. As most of my ancestry is Irish I was hoping to have a converted version as my last name was based on occupation (along the lines of names such as Smith). The original spelling would of course be in Olde English (Sceapherde) meaning Sheep Herder, but my middle name Alan (my Da & Grandad's first name) has Gaelic origins - Álainn. I've considered using both original versions for quite some time (4 years or so) but would rather have it be written exclusively Irish.
My first name - Scott - has Olde English origins as well, but it was picked simply because my Ma didn't know any bad people with the name Scott, I have zero Scotsman in my blood (as far back as I can tell). I know the word originated in England to describe the Scot's, but I know of no Irish equivilent, any help here would be greatly appreciated..

Sláinte,
Scott Alan Shepherd

The word for "shephard" is "aoire".But in a surname, it would be written as "Ó hAoire".(O HEAR-E)

Offhand I don't see any Irish equivalent for the surname Shepherd/Sheppard. The surname has existed in Ireland since the thirteenth century. MacLysaght says that the names first occurs in Cos. Dublin and Kildare as 'le Shepherd' (that's a lower case 'l'). That's not to say there isn't some unrelated Irish surname based on the occupation (aoire or tréadaí), but I can't think of one and don't see one so far in the books. Now if your distant ancestor had tended cows instead of sheep you could go with Ó Buachalla (Buckley) which is based on buachaill, meaning (cow)boy.

Ó hAoire is nice, a Laignigh. You could also have Mac an Aoire or Mac Aoire by analogy with Mac an Ghabhann and Mac Gabhann (Smith). (But as far as I know, Scott, none of these names we based on aoire have previously existed as surnames.)