The Spanish word 'cochinillo' (meaning 'suckling pig') has an interesting onomatopoeic origin. It starts with 'cocho', which was a sound used to call pigs - similar to how English speakers might use 'here piggy piggy'. From this pig-calling sound, the Spanish word 'cochino' meaning 'pig' was derived. Finally, 'cochinillo' was formed by adding the diminutive suffix '-illo' to 'cochino', literally meaning 'little pig', but specifically referring to a suckling pig - a young pig still nursing from its mother.

A simpler and more common related Spanish word is 'cochino', which simply means 'pig' in general. This word is more frequently used and might also be used figuratively to describe someone as messy or dirty, similar to how 'pig' can be used in English.

While there aren't direct English cognates since this word comes from an onomatopoeia specific to Spanish, it's interesting to note that English also has animal-calling words that became names for animals. For example, 'kitty' (from 'kit-kit' used to call cats) or 'chick' (possibly from the sound used to call chickens).