The Spanish word 'flaquito' comes from combining the adjective 'flaco' (meaning 'thin' or 'weak') with the diminutive suffix '-ito'. The base word 'flaco' itself derives from the Latin word 'flaccus', which meant 'flabby' or 'weak'. When you add the diminutive '-ito' to 'flaco', it creates an affectionate or diminutive form meaning 'little thin one' or 'skinny little one'.

This is a great example of how Spanish frequently uses diminutive suffixes like '-ito' to add nuance and emotional context to words. The suffix '-ito' not only indicates smallness but often adds a sense of endearment or affection to the base word.

The simpler and more common Spanish word 'flaco' is obviously related to 'flaquito', being its base form. 'Flaco' is a very common Spanish adjective meaning 'thin' or 'skinny'. You might hear it in everyday phrases like 'estar flaco' (to be thin) or 'ponerse flaco' (to become thin).

While there isn't a direct commonly used English descendant of Latin 'flaccus', we do have the somewhat formal or technical word 'flaccid', which means 'soft and weak, lacking firmness'. This comes from the same Latin root 'flaccus' that gave Spanish 'flaco' and 'flaquito'. You can see how the meaning shifted slightly - from the general idea of 'weak/soft' in Latin, to specifically 'thin' in Spanish, while English maintained more of the original 'soft/weak' sense in 'flaccid'.