Where does “Altham” come from?

Altham (English) comes from Old English hamm, from Proto-Germanic hammō, from Proto-Indo-European kónh₂m — leg.

Ancestry of “Altham”, step by step

Step	Language	Word	Meaning
1	Old English	hamm	ham, inner knee; enclosure, piece of enclosed...
2	Proto-Germanic	hammō	shinbone; the hollow of the knee; ham
3	Proto-Indo-European	kónh₂m	leg

Altham — Etymology, Origin & Word History | Etymology Explorer