The Spanish word 'vocal' comes from the Latin word 'vocalis', meaning 'vocal' or 'sonorous'. This Latin word was derived from 'vox', meaning 'voice' or 'sound'. The development from Latin to Spanish maintained both the form and meaning quite closely, with 'vocal' referring to anything related to the voice or vocal sounds.

Several common Spanish words share this Latin root, including 'voz' (voice), 'vocero' (spokesperson), and 'vocabulario' (vocabulary). All these words maintain a connection to the original concept of voice and sound.

English speakers might recognize the connection to several familiar words like 'voice', 'vocal', 'vocabulary', and 'vocalize'. These English words share the same Latin ancestor 'vox' and maintain similar meanings related to speaking and sound. The English word 'vocal' is actually a direct cognate of the Spanish 'vocal', as both came from Latin 'vocalis'.