c. 1200 (as a surname), "one who cards wool," agent noun from comb (v.). Meaning "a long, curling wave" is 1840, American English, from comb (v.), in reference to a wave, "roll over with a white foam" (1808), which is perhaps from resemblance to a fowl's comb.
comatose
comb
combat
combatant
combative
comber
combination
combine
combo
combust
combustible