The Spanish word 'muchachita' meaning 'little girl' has an interesting etymology that traces back to the Latin word 'mutilus' meaning 'mutilated' or 'cropped'. This Latin word evolved into the Spanish 'mocho' meaning 'cropped' or 'shorn'. From 'mocho' came the archaic Spanish term 'mochacho' meaning 'boy', which then developed into the modern Spanish 'muchacho' (boy). The diminutive suffix '-ita' was added to create 'muchachita', literally meaning 'little girl'.

The semantic evolution from 'mutilated/cropped' to 'boy/girl' might seem unusual, but it possibly relates to the practice of cutting or cropping hair, which was often associated with young people or children in various cultures.

The most common related Spanish word is 'muchacho' (boy) and its feminine form 'muchacha' (girl), which are much more frequently used than 'muchachita'. These words are the base forms without the diminutive suffix. Another related Spanish word is 'mocho', meaning 'cropped' or 'cut off', though this word is less commonly used in modern Spanish.

While there aren't any commonly used English words that directly come from the same Latin root 'mutilus', the English word 'mutilate' shares this Latin ancestor. This connection helps illustrate the original meaning of 'cropped' or 'cut' that evolved into the modern Spanish words for boy and girl.