Albert Barnes Commentary Proverbs 31:2

"What, my son? and what, O son of my womb? And what, O son of my vows?" — Proverbs 31:2 (ASV)

The repetitions are emphatic; expressive of anxious love.

Son of my vows - Like Samuel, and Samson, the child often asked for in prayer, the prayer ratified by a vow of dedication. The name Lemuel (literally “for God,” consecrated to Him) may be the expression of that dedication; and the warning against indulging in wine (Proverbs 31:4) shows that it had something of the Nazarite or Rechabite idea in it.