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Seems kind of weird that it’s an 8/8 on such a small body like in the art. Like the huge plant dragon is 5/5 and this chick is supposed to be bigger?
Tirnenn are actually very large characters. Sesselie is as tall (or taller, maybe) than Kel'Thuzad I believe.
Was Sesselie chosen due to having a more pronounceable name compared to the other tiernnen?
Maybe...
Tirnenn character names are a fusion of Welsh, Gaelic, Scottish, Irish, English and some onomatopoeic sounds.
You can read more here from this discussion thread on /r/wow
The names are corruptions of at least 3 languages, but I'll do my best.
Angwyrdmn = Angwyr means Angler, Angwyrd means angst. I suppose you'd have to look at context to figure out the actual meaning for this one. If he's a fishing trainer or vendor, it's safe to say its meant to mean Angler. But Angst could also be the one, because I can't find a single translation for what "dmn" might mean, so it might just be a corruption of the English "Damn". Giving the NPC the name Angst-Damn. Which would also make sense.
Groonoomcrooek = This isn't Welsh, but could be Gaelic, as they use sounds to describe things sometimes. In this case, this sounds like a toad croaking does it not? So his name is just the sound of a toad croak.
Cemnwyleeafee = This one is easy, as Cemnwyl means worthy or holy. And leafeee is just a corruption of leafy from English. So this one means, "worthy/holy and leafy."
Either way, cool fusion of Welsh, Gaelic and English here.
Thank you /u/Alundra828 - there's some great discussion elsewhere in that thread if you want to peruse.
Sesselie specifically is a reference to Seelie and Unseelie Courts of the Fairies in Scottish Folklore. Thanks to wowhead commentator vioeleta for that.
Her alignment to the Scottish folklore in World of Warcraft is up for debate, though in Murder at Castle Nathria she might be more Unsesselie than Sesselie given this murder most foul.
Tishereenelee was a solid runner up for "most easily pronounced Tirnenn name" but the competition for "least easily pronounced Tirnenn name" is much more interesting lol.