different between ladkin vs ladykin

English

lad +? -kin

ladkin (plural ladkins)

A little lad.
- 1642, Henry More, Psychozoia
  Tharrhon that young ladkin hight,
  He prayed this aged Sire for to reveal
  What way this Dragons poysonous despight

lady +? -kin

ladykin (plural ladykins)

A little lady.
- 1610, The Tempest, by Shakespeare, act 3 scene 2
  By'r lakin, I can go no further, sir; / My old bones ache [...]

Applied during the reign of Queen Elizabeth I, in the abbreviated form Lakin, to the Virgin Mary. The diminutive does not refer to size, but is equivalent to "dear".

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