Derivation of 'Hack' in place names
haca (Old English) A hook.
pers.n. (Old English) pers.n. Personal name
ēg (Anglian) An island. In ancient settlement-names, most frequently refers to dry ground surrounded by marsh. Also used of islands in modern sense. In late OE names: well-watered land.
A hook seems appropriate if it was a spear-phishing attack.
[I can't find the derivation of the word 'derivation'. Like the old Steven Wright joke, "What's another word for thesaurus?"]