Knave /(nāv)/

Knave

n.
  1. A boy; especially, a boy servant. [Obs.]
    O murderous slumber, Lay'st thou thy leaden mace upon my boy That plays thee music ? Gentle knave, good night.
  2. Any male servant; a menial. [Obs.]
    He's but Fortune's knave, A minister of her will.
  3. A tricky, deceitful fellow; a dishonest person; a rogue; a villain.
    In defiance of demonstration, knaves will continue to proselyte fools.
    — Ames.
  4. A playing card marked with the figure of a servant or soldier; a jack; as, the knave of hearts.

Phrases & Compounds
Knave child
a male child.