The Spanish word 'tampoco' (meaning 'neither' or 'not either') is a compound word formed from two Latin roots. The first part comes from the Latin word 'tantus' meaning 'so much', which evolved into 'tam' ('so') in Latin, and then became 'tan' in Spanish. The second part comes from Latin 'paucus' meaning 'few' or 'little', which evolved into Spanish 'poco' ('little'). When these elements combined, they formed 'tampoco', literally meaning something like 'so little' before evolving to its current meaning of 'neither' or 'not either' in negative contexts.

Two common Spanish words that are etymologically related to 'tampoco' are 'tan' (meaning 'so' or 'as') and 'poco' (meaning 'little' or 'few'). These are actually the two components that merged to form 'tampoco'. You might hear 'tan' in phrases like 'tan grande' (so big) or 'tan bueno' (so good), while 'poco' is commonly used in phrases like 'un poco' (a little) or 'poco tiempo' (little time).

While there aren't any common English words directly related to 'tampoco', we can find some connections through Latin. The Latin word 'paucus' (meaning 'few' or 'little'), which gave us the 'poco' part of 'tampoco', is related to English words like 'paucity' (meaning 'the presence of something in only small or insufficient quantities'). This comes from the same Latin root and maintains a similar meaning of 'fewness' or 'scarcity'.