The Spanish word 'caja' (meaning 'box') comes from the Latin word 'capsa', which also meant 'box' or 'case'. Going back further, 'capsa' derives from the Latin verb 'capere', meaning 'to take' or 'seize'. This evolution makes intuitive sense, as a box is something that 'takes' or 'holds' items inside it.

Some related Spanish words include 'cajón' (drawer), 'cajero' (cashier/ATM), and 'cajita' (little box). All these words share the root 'caja' and relate to containers or storage.

Several English words share the same Latin root 'capere'. For example, 'capsule' comes directly from a diminutive form of 'capsa'. Other English words that derive from 'capere' include 'capture', 'capable', and 'captive' - all relating to the original meaning of 'taking' or 'seizing'. The word 'case' (as in a container or box) is also related, coming from the same Latin 'capsa'.