Charles Ellicott Commentary 1 Chronicles 26:7

"The sons of Shemaiah: Othni, and Rephael, and Obed, Elzabad, whose brethren were valiant men, Elihu, and Semachiah." — 1 Chronicles 26:7 (ASV)

And Obed, Elzabad. This is probably corrupt, as the conjunction, which is used with the preceding names, is missing between Obed and Elzabad. Probably Obed-Elzabad is a corruption of some single name, perhaps Obed-el (compare the Syriac and Arabic, Ubdâêl and Ufîdîlu), or Abdiel (1 Chronicles 5:15; Syriac, Abdâêl; Arabic, Afâdîlu); see Note on 1 Chronicles 26:12. (Those two versions, however, give six names, while the Septuagint gives eight.)

Whose brethren were strong men. The Hebrew has “his brethren.” The conjunction appears to be missing again. Read: And his brethren, sons of strength, Elihu and Semachiah.