Take the 2-minute tour ×  I have in the past, and continue
currently, used the handle "thanatos" on a lot of Internet
sites, and if that isn't available (which happens ~50% of the
time), "deathanatos".  "Thanatos" is the name of the Greek god
or personification of death (not to be confused with Hades, the
Greek god of the underworld). "Dea" is a natural play-on-words
to make the handle work in situations where the preferred handle
has already been taken, without having to resort to numbers and
remaining pronounceable. I adopted the handle many years ago —
at the time, I was reading Edith Hamilton's Mythology, and Piers
Anthony's On a Pale Horse, both still favorites of mine, and the
name was born out of that.  When I created the handle, I was
fairly young, and valued privacy while online, not giving out my
name. As I've become a more competent programmer, I'm starting
to want to release some of my private works under FOSS licenses
and such, and sometimes under my own name. This has started to
tie this handle