The Spanish word 'añito' comes from combining the Spanish word 'año' (meaning 'year') with the diminutive suffix '-ito'. The base word 'año' itself derives from Latin 'annus' meaning 'year'. The diminutive suffix '-ito' adds a sense of smallness, endearment, or cuteness to the word, so 'añito' literally means 'little year' or 'dear year'.

This is a perfect example of how Spanish frequently uses diminutive suffixes to create more emotionally expressive or nuanced versions of words. The '-ito' suffix is one of the most common diminutive suffixes in Spanish.

The most obvious related Spanish word is 'año' (year), which is the base word from which 'añito' is derived. Other common related words include 'anual' (annual), 'añejo' (aged, vintage), and 'añada' (vintage, harvest year). All these words share the same Latin root 'annus' and relate to concepts of time and years.

Several common English words share the same Latin ancestor 'annus'. These include 'annual' (yearly), 'anniversary' (yearly commemoration), 'perennial' (lasting through years), and 'biennial' (occurring every two years). The connection between these English words and 'añito' becomes clear when you consider they all relate to the concept of years and time periods.