From regel; a footman (soldier) -- (on) foot(- man).
see HEBREW regel
H7273. ragli
רַגְלִי adjective on foot; &; ר ׳אִישׁ (after number) footmen, especially foot-soldiers, Judges 20:2; 2 Samuel 8:4 = 1 Chronicles 18:4; 19:18 (מָּרָשִׁים in "" 2 Samuel 10:18); elsewhere ׳ר as substantive, usually collective, of Israel at Exodus. Exodus 12:37; Numbers 11:21 (both J E); = foot-soldiery 1 Samuel 4:10; 15:4; 2 Samuel 10:6; 1 Kings 20:29; 2 Kings 13:7; plural noun רַגְלִים footmen, men on foot Jeremiah 12:5 (opposed to הַסּוּסִים).