The Spanish word 'cefalópodo' comes from Scientific Latin 'Cephalopoda', which is the taxonomic class name for cephalopods (like octopuses and squids). This scientific term was created by combining two Ancient Greek words: 'κεφαλή' (kephale) meaning 'head' and 'πούς' (pous) meaning 'foot'. This name was chosen because cephalopods are characterized by having their feet/tentacles attached to their heads, making them literally 'head-footed' creatures.

Some related Spanish words include 'cefálico' (meaning 'cephalic' or 'relating to the head') and 'cefalea' (meaning 'headache'), which both share the same Greek root 'κεφαλή' (head).

English speakers might recognize the root in words like 'cephalic' (relating to the head), 'encephalon' (the brain), and of course 'cephalopod' itself. The 'pod-' part appears in English words like 'podiatrist' (foot doctor) and 'tripod' (three-footed stand).