The Spanish word 'naturalizado' (meaning 'naturalized') has its roots in Latin, starting with 'natus' meaning 'born'. This combined with the Latin suffix '-ura' (indicating the result of an action) to form 'natura' meaning 'nature'. The addition of the Latin suffix '-alis' (meaning 'relating to') created 'naturalis', meaning 'natural' or 'by birth'.

This evolved into the Spanish word 'natural', which then combined with the Spanish suffix '-izar' (meaning 'to make into') to form the verb 'naturalizar' ('to naturalize'). Finally, the past participle suffix '-ado' was added to create 'naturalizado', meaning 'naturalized' - referring to someone or something that has been granted the same status as something that is natural or native.

Several common Spanish words share this etymology. The simpler word 'natural' means 'natural' or 'native' and is very frequently used. 'Naturaleza' means 'nature' and comes from the same Latin root 'natura'. The verb 'nacer' (to be born) is also related, coming from the Latin 'natus'.

Many English words are cognate with 'naturalizado' through their shared Latin ancestry. The most obvious are 'natural', 'naturalize', and 'naturalized', which follow almost the same pattern of formation. Other related English words include 'nature', 'native', and 'natal', all stemming from Latin 'natus' meaning 'born'.