חָמוּלChâmûwl

proper name, masculine: grandson of Judah (Genesis 46:12; 1 Chronicles 2:5; Numbers 26:1)

Pronunciation: khaw-mool' · Hebrew/Aramaic (Old Testament) · H2538

Same root

חָמַלchâmal · H2550to commiserate; by implication, to spare
חָמוּלִיChâmûwlîy · H2539a Chamulite (collectively) or descendants of Chamul

Where it appears

Appears 3 times in the Bible.

Genesis 46:12 The sons of Judah were Er, Onan, Shelah, Perez, and Zerah (though Er and Onan had died in the land of Canaan). The sons of Perez were Hezron and Hamul.
Numbers 26:21 These were the subclans descended from the Perezites: The Hezronites, named after their ancestor Hezron. The Hamulites, named after their ancestor Hamul.
1 Chronicles 2:5 The sons of Perez were Hezron and Hamul.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).