This could work with Orion Pax. The myth of Orion is very old on Earth, a myth we get from ancient Greece which in all likelihood predates ancient Greece. And "Pax" is just Latin for "peace." So "Orion Pax" could be a translation of "peaceful hunter" or, if you wanted to stretch it, a warrior who fights in the hope of achieving peace. Which is very on brand for Optimus Prime.I've always favoured a more abstract translation.
Cybertronian name: *high-pitched digital tone*
Literal translation: Syncopated rhythm arising from apparent chaos
"Fixed" translation: Jazz
Cybertronian name: *modulating digital beeps*
Literal translation: Hunter tracking prey through shadows
"Fixed" translation: Prowl
Cybertronian name: *shrill screech*
Literal translation: Last radiometric signal from a collapsing singularity
"Fixed" translation: Starscream