Webster's Revised Unabridged Dictionary · 1913

Kidnap

Kidnap (kid"nap`) , transitive verb

[Kid a child + Prov. English nap to seize, to grasp. Compare Knab, Knap, Nab.]

To take (any one) by force or fear, and against one's will, with intent to carry to another place. — Abbott
You may reason or expostulate with the parents, but never attempt to kidnap their children, and to make proselytes of them. — Whately

Originally used only of stealing children, but now extended in application to any human being, involuntarily abducted.