This might be a weird one.
I was never really the most creative, and i was especially bad at naming things. So when I was a really small kid i used to play this obscure but really generic browser mmo.....of uh um Fairy Tail. And i was at like 1st grade back then so i didnt even know much of what i was doing on there, it gave me a randomized English username; "Phil Holm" and i just thought its the character's name and didn't even change it.
Sometimes I played that game like 8 hours a day on my brother's laptop when my parents weren't home to yell at me. I even got my character to rank A and was this close to getting rank S. Unfortunately, the server i was playing on got shutdown and i lost everything. Some time later, that game also shutdown (more like replaced by another game, i never liked the newer one as much) And well since then I've been using that same username on everything everywhere, as an homage i suppose, also partly because i couldn't come up with anything better (I had tried countless times).
Then one day after many years i finally modified it a bit, to make it sound more like an actual username/gamertag rather than some european dude's government name,
Behold, PhilthyWeeb
Yes, a pun. The epitome of my creative struggles.
Side note: As for why a 1st grader liked such a fan service heavy bait anime as Fairy Tail, I SWEAR ITS NOT WHAT YOU THINK!
Ahem, rest assured i hadn't reached puberty yet. We used to have Animax on TV back then and Fairy Tail had a more modern artstyle to it compared to the other old school 90s and early 2000s animes that would air normally and so i was drawn to it, also i found Natsu cool.
TL;DR : I literally got it from a random name generator.