The Spanish word 'legendario' (meaning 'legendary') has its roots in Latin. It starts with the Latin verb 'legere' meaning 'to read'. This was combined with the gerundive suffix '-nda' (indicating 'must be') to form 'legenda', meaning 'what must be read'. The word then took on the suffix '-arius' (meaning 'belonging to') to become 'legendarius' in Latin, literally meaning 'belonging to things that must be read'. This eventually evolved into the Spanish 'legendario'.

This etymology helps explain why legends are called legends - they were originally stories that were considered important enough that they must be read and passed down. The meaning evolved from 'something that must be read' to 'traditional story' to finally 'mythical or extraordinary'.

The Spanish word 'leyenda' (meaning 'legend') is a close relative of 'legendario'. It comes from the same Latin root 'legenda' (what must be read). While 'legendario' describes something as being legendary or mythical, 'leyenda' is the actual legend or story itself.

Another related Spanish word is 'leer' (to read), which comes from the same Latin verb 'legere' that started this whole word family. This connection shows how reading, legends, and legendary things are all historically connected in Spanish.

The English word 'legend' is a cousin of 'legendario', both coming from Latin 'legenda'. The English 'legendary' is particularly close in both meaning and form to the Spanish 'legendario', as both developed from Latin 'legendarius'.

The English word 'legible' (meaning 'readable') is also related, coming from the same Latin root 'legere' (to read). This connection shows how the concepts of reading and legends are historically linked in both English and Spanish.