Why is this called Tomisimo?

Why is this called Tomisimo?
 

I am sure it has been asked and answered dozens of times, but I remain curious.

why "Tomisimo"? what does it mean that I don't get?

Have a look here.

thank you
but that link ( https://forums.tomisimo.org/showthread.php?t=218)
is coming up "Site Not Found"

I have corrected the link (removed the 's' in 'https://').
The thread title is 'The name Tomísimo."