The Spanish word 'sótano' (meaning 'basement') can be traced back to Latin roots. It begins with the Latin preposition 'sub' meaning 'under', which evolved into the Latin adverb 'subtus' meaning 'below'. From this, the Late Latin term 'subtulus' was formed to refer to the 'lower part of a building'. This term evolved into Old Spanish 'sótalo' and finally into the modern Spanish 'sótano', maintaining its meaning of 'basement' or underground space.

Some related Spanish words that share the 'sub-' root include 'subterráneo' (underground), 'submarino' (submarine), and 'subsuelo' (subsoil). All these words maintain the core meaning of being 'under' or 'below' something else.

English speakers can connect 'sótano' to many familiar English words that begin with 'sub-', all derived from the same Latin root 'sub' meaning 'under'. Some examples include 'subway' (underground railway), 'submarine' (underwater vessel), 'subterranean' (underground), and 'subtract' (to take from under). Understanding this connection can help remember that a 'sótano' is always located under or below the main structure of a building.