Nah I just took en.wiki's word for it which is always dangerous );
If I really have to push the theory, it would be an old high German form of Haupt (referring to an cowshead), since a hill can be head-shaped :)
Otoh I would not go against the word of someone who has probably seen the medieval docs
Edit: de.wiki link you gave mentions the ford
Wahrscheinlich ist der Name der Burg vom althochdeutschen Wort hab oder haw abgeleitet, das «Flussübergang» bedeutet. Damit ist eine Furt bei Altenburg gemeint
If I really have to push the theory, it would be an old high German form of Haupt (referring to an cowshead), since a hill can be head-shaped :)
Otoh I would not go against the word of someone who has probably seen the medieval docs
Edit: de.wiki link you gave mentions the ford
Wahrscheinlich ist der Name der Burg vom althochdeutschen Wort hab oder haw abgeleitet, das «Flussübergang» bedeutet. Damit ist eine Furt bei Altenburg gemeint