The Spanish word 'ladrón' (meaning 'thief') has an interesting journey through history. It comes from the Latin word 'latro' which meant 'mercenary' or 'bandit'. This Latin word, in turn, was borrowed from the Ancient Greek 'latron', which originally meant 'payment' or 'hire'. The semantic shift from 'payment/hire' to 'mercenary' and finally to 'thief' reflects how hired soldiers sometimes turned to banditry and robbery when not employed in military service, eventually leading to the modern Spanish meaning of a person who steals.

Some related Spanish words include 'ladronzuelo' (petty thief), and 'ladronería' (thievery). The feminine form 'ladrona' is also commonly used. These words all share the same root and basic meaning related to theft.

While English doesn't have many common modern words directly related to 'ladrón', the term 'larceny' (meaning theft of personal property) comes from the same Latin root 'latro'. The word 'latrociny', though rare in modern English, is also related and means robbery or theft.