Taliesin was a sixteenth century Welsh poet (male). Tal yes in is correct welsh pronunciation. Tall ee esin would be an anglicised pronunciation, where the speaker is unaware of the sound 'y' makes in Welsh. ( it's a kind of ur' sound)
I've been saying it Tal-yes-in in my head all day and I really love it,I also still love Tal-es-in....Tal-ee-ESS-en feels a little long unles the 'ee-ESS' are very short,in which case it starts to sound very much like Tal-yes-in though it seems there is a divide on the pronunciation,even within Wales.
It is nevertheless at the very top of my Boys list for that elusive baby
I love it as much as I love my DS's name,I thought I'd never find another I liked as much so im very happy
I heard it on Child of Our Time last night for the first time. What a fab name! Definitely top of my list if I ever have another boy (doubtful as DS3 only 8 weeks, DS2 embracing the Terrible Threes and DS1 6-going-on-16.....)
tal-YES-in, although tal-EE-es-in is a reasonable approximation for non-Welsh speakers. It's pronounced incorrectly on Child of our Time, as CelticPromise says, and has irritated me for the past umpteen years! Lovely lovely name.