"make a sound like a crow, raven, etc.," 1580s, imitative. "Similar imitative forms occur in many and diverse languages, to express the cry or as a name for the crow and other corvine birds" [Century Dictionary]. Related: Cawed; cawing.
caw (n.)
1660s, from caw (v.).
cavil
cavitate
cavitation
cavity
cavort
caw
Caxton
cay
cayenne
cayuse
CB