The Spanish word 'roble' meaning 'oak tree' comes from Old Spanish 'robre', which in turn derives from Latin 'robur'. The Latin word 'robur' had a dual meaning of both 'oak tree' and 'strength', reflecting the oak's symbolic association with power and durability in ancient Roman culture. The word evolved phonetically from 'robur' to 'robre' and finally to the modern Spanish 'roble', while maintaining its meaning of 'oak tree' throughout this evolution.

While 'roble' itself is a relatively simple and common Spanish word, there are related Spanish words like 'robusto' (robust, strong) that also derive from the same Latin root 'robur', maintaining the connection to the concept of strength that was present in the original Latin word.

English speakers might recognize the connection to words like 'robust' and 'corroborate', which also come from Latin 'robur'. Just as 'robusto' in Spanish means 'strong' or 'sturdy', English 'robust' carries the same meaning, reflecting the strength associated with the oak tree in the original Latin. 'Corroborate' literally meant 'to strengthen' in Latin, and now means 'to confirm or give support to' in English.