The Spanish word 'merecidísimo' meaning 'most deserved' has its roots in the Latin verb 'merere', which meant 'to earn' or 'deserve'. This evolved into the Vulgar Latin 'merescere' meaning 'to be worthy'. In Spanish, this became the verb 'merecer' ('to deserve'), which led to its past participle 'merecido' ('deserved'). The superlative form 'merecidísimo' was created by adding the Spanish superlative suffix '-ísimo' to 'merecido', intensifying its meaning to 'most deserved' or 'very much deserved'.

Some simpler and more common Spanish words that share this etymology include the basic verb 'merecer' (to deserve), its past participle 'merecido' (deserved), and the noun 'mérito' (merit). These are all more frequently used than the superlative form 'merecidísimo' and share the core meaning of deserving or earning something.

English speakers might recognize the connection to words like 'merit', 'meritorious', and 'merited', which all come from the same Latin root 'merere'. Just as 'merecidísimo' refers to something highly deserved, these English words all relate to the concept of deserving or earning something through one's actions or qualities.