The Spanish word 'bendecido' (meaning 'blessed') comes from the Spanish verb 'bendecir' ('to bless'), which in turn derives from the Latin word 'benedicere'. The Latin 'benedicere' is a compound word formed from two parts: 'bene' meaning 'well' or 'good', and 'dicere' meaning 'to say'. So literally, 'benedicere' meant 'to speak well of' or 'to say good things about', which evolved to mean 'to bless' in both Latin and Spanish. The form 'bendecido' is the past participle of 'bendecir', used as an adjective meaning 'blessed'.

Some related Spanish words that might be familiar to Spanish learners include 'bendición' (blessing), which is the noun form related to 'bendecir'. There's also 'bien' (well/good), which comes from the same Latin root 'bene' that formed part of 'bendecido'. The word 'decir' (to say) is also related, coming from the Latin 'dicere' that formed the second part of the compound word.

English speakers might recognize the connection to words like 'benediction' (a blessing, especially at the end of a religious service) and 'benevolent' (kind, generous), both of which contain the Latin root 'bene-' meaning 'well' or 'good'. The '-dict-' part in 'benediction' comes from the same Latin 'dicere' (to say) that we see in 'bendecido', and it appears in other English words like 'dictate', 'predict', and 'dictionary'.