From the same as chowmah; a father-in-law (as in affinity) -- father in law.
see HEBREW chowmah
H2524. cham
II. חָם husband's father, see חמה.
II. [חָם] noun masculine husband's father (Late Hebrew id., of husband's or wife's father, so Aramaic חֲמָא; Arabic husband's male relation (father, brother, paternal uncle), but also wife's father, etc.; Ethiopic Assyrian êmû, ZimBP 48); — only suffix חָמִ֫יךָ Genesis 38:13, 25, of Judah as Tamar's father-in-law; חָמִיהָ 1 Samuel 4:19, 21 of Eli, father-in-law of Phinehas' wife.