@Adorable: To my knowledge, Trelw has absolutely no meaning in any of about 6000 languages that are currently spoken on Earth. It is very much just my character’s name.
As to the story of the name… Trelw was created in April 2008 with several other characters, so I do not recall all that I thought of at the time, but…
There are four letters from my various real names (first one contains e and r, second e and l and the last one e, r and t). Trelw was the third horde character I ever made (seventh overall) and several languages have words resembling tre with meaning of 3. My home town is sometimes shortened as TRE in postal addresses. Trelw might have ended up as leatherworker (LW), but finally did not. Many of my troll characters have name beginning with TR(oll). Extremely unoriginal, I know, but there you go.