The Spanish word 'son' comes from the Latin word 'sonus', meaning 'sound'. While the Latin term referred to sound in general, the Spanish word 'son' specifically refers to musical sound or rhythm, particularly in the context of Latin American music. This semantic narrowing reflects how the word evolved to specifically describe musical elements in Spanish culture.

Some related Spanish words include 'sonido' (sound), 'sonar' (to sound), and 'sonoro' (sonorous). All these words share the same Latin root 'sonus' and maintain connections to the concept of sound, though 'son' specifically evolved to refer to musical sound and rhythm.

English speakers might recognize this connection in words like 'sound', 'sonic', and 'sonata'. While these English words come from the same Latin root 'sonus', they maintained a broader meaning related to sound in general, unlike the Spanish 'son' which specialized to mean musical sound. The word 'sonorous', meaning 'having a full, deep sound', is particularly close to the Latin original.