The Spanish word 'sanito' comes from combining the Spanish adjective 'sano' (meaning 'healthy') with the diminutive suffix '-ito'. The base word 'sano' derives from Latin 'sanus', meaning 'healthy' or 'sound'. The diminutive suffix '-ito' adds a sense of smallness or endearment, making 'sanito' mean 'little healthy one' or 'somewhat healthy'.

This is a typical example of Spanish word formation where the diminutive suffix '-ito' is added to create a more affectionate or diminished version of the original word.

The most obvious related Spanish word is 'sano' (healthy), which is the base word from which 'sanito' is formed. Other common related words include 'sanar' (to heal), 'sanidad' (health, sanitation), and 'saneamiento' (sanitation, drainage). All these words share the core meaning of health and wellness from their Latin root.

Several English words share the same Latin ancestor 'sanus'. The most notable ones include 'sane' (mentally healthy), 'sanity' (mental soundness), 'sanitary' (relating to health and cleanliness), and 'sanitation' (conditions relating to public health). While the Spanish words focus more on general health and wellness, the English derivatives often emphasize mental health or cleanliness.