lambkin n.

Old English lamb, lomb, Northumbrian lemb "lamb," from Proto-Germanic *lambaz (source also of Old Norse, Old Saxon, Old Frisian, Gothic lamb, Middle Dutch, Dutch lam, Middle High German lamp, German Lamm "lamb"). Common to the Germanic languages, but with no certain cognates outside them. The -b has probably been silent since 13c.

The Old English plural was sometimes lambru. A symbol of Christ (Lamb of God), typified by the paschal lamb, from late Old English. Applied to gentle or innocent persons (especially young Church members) from late Old English; from mid-15c. of persons easy to cheat ("fleece"). Also sometimes used ironically for cruel or rough characters (such as Kirke's Lambs in Monmouth's rebellion, 1684-86, "an ironical allusion to the device of the Paschal Lamb on their flag" [OED]); Farmer and Henley ("Slang and Its Analogues") say "specifically applied to Nottingham roughs, and hence to bludgeon men at elections." Diminutive form lambie is attested from 1718. Lamb's-wool is from 1550s as a noun, 1825 (also lambswool) as an adjective.

diminutive suffix, first attested late 12c. in proper names adopted from Flanders and Holland. As it is not found in Old English it probably is from Middle Dutch -kin, properly a double-diminutive, from -k + -in. Equivalent to German -chen. Also borrowed in Old French as -quin, where it usually has a bad sense.

This suffix, which is almost barren in French, has been more largely developed in the Picard patois, which uses it for new forms, such as verquin, a shabby little glass (verre); painequin, a bad little loaf (pain); Pierrequin poor little Pierre, &c. ["An Etymological Dictionary of the French Language," transl. G.W. Kitchin, Oxford, 1878]

Used in later Middle English with common nouns. In some words it is directly from Dutch or Flemish.