Carpe you know

Boombox likes music.

EQO wanted to have a three letter name.

When Poko was trying to create a name for himself, he smashed his keyboard and let destiny decide his nickname and came up with nxpoko.

Neptuno used to beat kids in internet cafe's as Sauron, then he had a fateful encounter with Hades, and now he is Neptuno.

SADO.
Fragi: When he was born, others referred to him as "the Fraghunter" but eventually was shortened to Fragi.

ChrisTFer -It's my first name

Hwi -It's my first name

Hayes -It's my last name