The Spanish word 'cómodo' (meaning 'comfortable' or 'convenient') comes from the Latin word 'commodus', which meant 'convenient' or 'suitable'. The Latin 'commodus' itself was formed by combining two elements: the prefix 'com-' meaning 'together' or 'with', and 'modus' meaning 'measure' or 'manner'. The combination of these elements suggests something that fits or measures well with something else, hence developing into the sense of being convenient or comfortable.

Some related Spanish words include 'comodidad' (comfort), 'acomodar' (to accommodate), and 'incómodo' (uncomfortable). These words all share the same root and maintain connections to the ideas of comfort, convenience, and suitable arrangement.

English speakers might recognize the connection to words like 'accommodate' and 'commodious', which both come from the same Latin root 'commodus'. 'Accommodate' maintains the sense of making something fit or suitable for use, while 'commodious' specifically refers to something spacious and convenient. The word 'commodity', though slightly different in modern meaning, also shares this ancestry, originally referring to something of suitable quality or measure.