The Spanish word 'hombre' meaning 'man' comes from the Latin word 'homo' (and its accusative form 'hominem'). As Latin evolved into Old Spanish, 'hominem' became 'omne'. This then changed to 'homre' in Medieval Spanish, before finally becoming the modern Spanish 'hombre'. This evolution shows a pattern of sound changes where the middle 'n' sound was gradually replaced by an 'r' sound (a process called dissimilation), and a 'b' was inserted between 'm' and 'r' to make the word easier to pronounce.

Some related Spanish words include 'humano' (human) and 'homicidio' (homicide), which both preserve the original 'hom-' root from Latin meaning 'man'.

English speakers can remember 'hombre' by connecting it to words like 'human', 'homicide', and 'homosapien', which all come from the same Latin root 'homo' meaning 'man'. While these English words maintained spelling closer to the original Latin, Spanish evolved the pronunciation and spelling more dramatically to arrive at 'hombre'.