Character Name / Steam Link

Is it possible to track down a old account from a character name? 

i've been trying to log in to my steam launcher but it says neither of my accounts made in 2022 are the one it is connected too, 

I have achievements on steam from 2020 and have a really old video ive managed to dig up that has what looks like my character name in it,  but not the account name, 

im at a loss as im currently waiting for steam support to reply to a help ticket, if its possible to track down account names from character names i can recover the password and unlink ect,

Any advice would be appreciated

Its a little blurry in the video so the name is either:

Kyrantios

or

Kyrantos