Can anyone point me to a site where I can learn the orginal pronunciations of the letters of the Irish alphabet?

The names of the letters in the Ogam alphabet have been sometimes applied to the Latin alphabet in Ireland and Scotland. Here's a site for the Ogam names:

http://www.csupomona.edu/~jcclark/ogham/ogh-alph.html

Here's a Scottish Gaelic version in Latin alphabetical order of the 18 letters that comprise the traditional Gaelic alphabet:

ailm, beith coll, dair, eadha, fearn, gort, (h)uath, iogh, luis, muin, nuin, onn, beith bhog, ruis, suil, teinne, ur

I think this use of Ogam names for Latin letters is a fairly recent development.

I dont understand the question. bé, cé, dé etc am I missing something?

He means all those tree names coded as letters

"orginal pronunciations of the letters of the Irish alphabet"

Swill it about. Just think of all the misconceptions that that phrase covers. No doubt the druids were using trees names before St Patrick. Not.