The Spanish word 'humanista' (meaning 'humanist') has its roots in Latin, tracing back to 'humus' meaning 'earth' or 'soil'. The Latin word 'humanus' ('human, humane') was formed by combining 'humus' with the suffix '-anus' meaning 'belonging to' - essentially describing humans as 'beings of the earth'. This Latin word evolved into Spanish 'humano', and then combined with the Spanish suffix '-ista' (meaning 'one who practices or studies') to form 'humanista'.

This etymology reflects how the concept of being human was originally tied to our connection with the earth, and how a humanist came to mean someone who studies or is concerned with human affairs, culture, and welfare.

The simpler and more common Spanish word 'humano' (human) is directly related to 'humanista'. While 'humano' refers to human beings in general, 'humanista' specifically refers to someone who studies or promotes human culture and welfare. Another related Spanish word is 'humanidad' (humanity), which shares the same root.

Several common English words are etymologically related to 'humanista', all tracing back to the same Latin roots. These include 'human', 'humane', 'humanity', and 'humanist' itself. The English word 'humus' (referring to organic matter in soil) preserves the original Latin meaning of 'earth'. This shows how both Spanish and English preserved different aspects of the original Latin terminology, with the 'earth/soil' meaning remaining in some words and the 'human/humane' meaning in others.