"Lamkin" or "Lambkin" (Roud 6, Child 93) is an English-language ballad. It gives an account of the murder of a woman and her infant son by a man, in some versions, a disgruntled mason, in others, a devil, bogeyman or a motiveless villain. Versions of the ballad are found in Scotland, England and the US.
According to Roud and Bishop
"Lambkin" is not one of the major league Child ballads in terms of popularity, but it was widely known in England and Scotland, and even more so in North America. ... . The central character's name varies considerably, including, in just the English versions 'Lambkin', 'Lamkin', Lincoln' and 'Limkin", and he is various referred to as 'Long', 'Bold', 'Cruel' and 'False'.
They cite the analysis of Ann Gilchrist, who identified two threads: one Scottish, which retained the mason narrative; one Northumbrian, which lost the mason in early versions, thus encouraging singers to supply a different back-story. Versions collected in England stem from the Northumbrian thread.
Other versions follow the same basic story, but the antagonist has many different names, among them "Long Lonkin" "Balankin", "Lambert Linkin", "Rankin", "Long Lankyn", and "Lammikin". Later versions lose the opening of the story, which explains that Lamkin is a mason who has not been paid; in these, Lamkin becomes a sort of a bogeyman who dwells in the wild places; the lord, before leaving, warns against him:
These versions add peculiar incidents that add to the grisliness of the crime. Lamkin and the nursemaid collect the baby's blood in a basin which, along with the idea that the name Lamkin or Lammikin indicates the murderer was pale skinned and, therefore, perhaps a leper who sought to cure himself by bathing in the blood of an innocent collected in a silver bowl, a medieval cure.