Discovery Box1 Chronicles 2:18 
Context2:18 Caleb son of Hezron fathered sons by his wife Azubah (also known as Jerioth). 1 Her sons were Jesher, Shobab, and Ardon.
1 Chronicles 2:42
Context2:42 The sons of Caleb, Jerahmeel’s brother:
His firstborn Mesha, the father of Ziph, and his second son Mareshah, 2 the father of Hebron.
1 tn Heb “and Caleb son of Hezron fathered [children] with Azubah, a wife, and with Jerioth.” Jerioth could be viewed as a second wife (so NLT; cf. also NASB, NIV, NRSV), but the following context mentions only “her [presumably Azubah’s] sons.” Another option, the one chosen in the translation, is that Jerioth is another name for Azubah.
2 tc Heb “and the sons of Mareshah,” but this does not fit contextually. Perhaps the text originally had וּבְנוֹ מִשְׁנֶה מָרֵשָׁה (uvÿno mishneh mareshah, “and his second son, Mareshah”), with מִשְׁנֶה (“second”) later accidentally falling out by homoioteleuton (cf. the note in BHS here).
