Easton's Bible Dictionary (1897)
Dedicated to God, a king whom his mother instructed (Prov. 31:1-9). Nothing is certainly known concerning him. The rabbis identified him with Solomon.
Smith's Bible Dictionary (1863)
(dedicated to God), the name of an unknown king to whom his mother addressed the prudential maxims contained in (Proverbs 31:1-9) The rabbinical commentators identified Lemuel with Solomon. Others regard him as king or chief of an Arab tribe dwelling on the borders of Palestine, and elder brother of Agur, whose name stands at the head of (Proverbs 30:1)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
LEM'UEL (dedicated to God), the name of the king to whom the counsels, contained in Prov 31:2-9 are addressed by his mother. The Rabbins identify Lemuel with Solomon; others consider the name a mere personification; nothing is known with certainty.
Hitchcock's Bible Names (1869)
God with them, or him