Companion; Compañero (Spanish); Copain (French) Companion
From the Latin "Companionem," which was, "one with whom you would eat bread" -- "Con" (with) and "Pan" (bread) -- presumably, your "companion" was someone with whom you would "break bread."
Cheers
From the Greek "Kara" for "face," via the Latin "Cara," and Old French "Chiere" for the same.
So "Be of good cheer," means, "Put on a happy face."
