LXX Num 1:5

καὶ ταῦτα τὰ ὀνόματα τῶν ἀνδρῶν οἵτινες παραστήσονται μεθ’ ὑμῶν· τῶν υἱῶν Ῥουβὴν Ἐλεισοὺρ υἱὸς Σεδιούρ·

These are the names of the men who are to assist you: From the tribe of Reuben, Elizur son of Shedeur;