A few recommendations:
Telesphorus. The name (via false cognates) suggests telecommunications and
light, which in this age of the internet, fiber optics, and glowing screens,
fits computers well. The name apparently actually means "accomplisher" or
"bringer of completion" which would be fitting once the distro is released.
Neto. Easy to say and pronounce. Worshipped by ancient Celts in the Iberian
peninsula, which fits Trisquel's origins as being targeted to
Celtic-descended people in a region of Spain. Downside for some is that this
was a god of war. https://en.wikipedia.org/wiki/Neto_(deity)
Ériu. Old name for Éire, the patron goddess of pre Christian Ireland. Its
appeal to the Irish and their diaspora could be seen as a feature (since the
Irish are the largest Celtic group worldwide) but also a bug, obscuring
Trisquel's Galician origins.
Llŷr. Has a very Celtic feel without being too difficult to spell. Too
Clíona (a more accessible spelling of Clíodhna). A pleasant ring to the
name, with some pleasant aspects to the myth, such as being a goddess of love
and beauty. Downside: some beliefs about her were of her as a banshee, a
wailing mourner of the dead. https://en.wikipedia.org/wiki/Cl%C3%ADodhna.