Analogous uses and popular etymology
By analogy "boy" can also refer as an anthropomorphic term to a young male (or any male) of another animal, either in general or species-specific; in the last case it may even have a specific term, notably derived from a boy's name, such as "billy goat" for a 'boy' goat, or tomcat (known since 1809, for any male cat; but just Tom, applied to male kittens, is recorded since c.1303)
Again by analogy "boy" can occasionally even refer to a 'male' object.
Some words contain 'boy' in English by mistake (folk etymology), actually referring to a (near) homophone such as French bois = "wood" (e.g. in "low boy", a type of furniture, and in "tallboy", both furniture and a high glass or goblet).

















