The Spanish word 'leporino' comes from the Latin word 'leporinus', meaning 'of or relating to a hare'. 'Leporinus' itself was derived from the Latin word 'lepus', which simply meant 'hare'. The term evolved to specifically refer to a harelip (cleft lip) in Spanish, likely due to the visual similarity between a cleft lip and the characteristic split upper lip of a hare.

While 'leporino' is a relatively specialized medical term in Spanish, it doesn't have many common related words in modern Spanish. However, the word 'liebre' (meaning 'hare') comes from the same Latin root 'lepus', though it followed a different path of evolution through Vulgar Latin.

In English, while we don't have many common words directly related to 'lepus', there are some scientific terms that share this root. For example, the biological family Leporidae includes rabbits and hares, and the scientific term 'leporine' means 'relating to or resembling a hare'. The word 'leprechaun' is not related, despite the similar beginning - it has completely different Celtic origins!