Amer. Heritage Dict.:
hook - ... 3. a. A sharp bend or curve, as in a river.
b. A point or spit of land with a sharply curved end. ...
[Middle English hok, from Old English hōc; see keg- in the Appendix of Indo-European roots.]
1. a. hake, from Old English haca, hook, akin to Old Norse haki, hook;
b. harquebus, from Middle Dutch hake, hook. Both a and b from Germanic *hakan‑.
2. a. hook, from Old English hōc, hook;
b. hooker1, from Middle Dutch hōk, hoec, hook;
c. haček; Hakenkreuz, from Old High German hāko, hook. a-c all from Germanic lengthened form *hōka‑.
3. hatchel, heckle, from Middle Dutch hekel, hatchel, a flax comb with long metal hooklike teeth, from Germanic *hakila‑.
4. hack1, from Old English -haccian, to hack to pieces as with a hooked instrument, from Germanic *hakkijan.
[Pokorny keg‑ 537.]