The Spanish word 'chavito' meaning 'little boy' comes from combining two elements: 'chavo' (meaning 'boy') and the diminutive suffix '-ito'. The base word 'chavo' has an interesting origin - it comes from Caló 'chavó', which in turn derives from the Romani word 'ćhavo', both meaning 'boy'. Romani is the language of the Roma people, and Caló is a Spanish Romani mixed language historically used in Spain. The diminutive suffix '-ito' is a very common Spanish ending that adds the meaning of 'small' or expresses endearment.

The most obvious related Spanish word is 'chavo', which simply means 'boy' without the diminutive ending. This word is commonly used in Mexican Spanish and some other Latin American varieties. Another related form is 'chava' (meaning 'girl'), which is the feminine version of 'chavo'.

While there aren't any common English words directly related to 'chavito', English has borrowed some Romani words through other routes. However, these borrowings are generally not related to the Romani word 'ćhavo' that gave us 'chavito'.