The Spanish word 'saca' comes from the Spanish word 'saco' (meaning 'sack'), which itself derives from Latin 'saccus' (meaning 'sack'). Going even further back, the Latin word comes from Ancient Greek 'sakkos' (σάκκος), also meaning 'sack'. While 'saco' retained the meaning of a physical sack or bag, 'saca' developed to also mean 'extraction' or 'withdrawal', likely from the action of taking things out of a sack.

The most obvious related Spanish word is 'saco', which means 'sack' or 'bag'. This is actually the parent word from which 'saca' developed. Another common related word is 'sacar' (to take out, to extract), which shares the same etymological root. These words form a family that connects the concepts of containers (saco) and the action of removing things (sacar, saca).

English speakers might recognize the connection to the word 'sack', which comes from the same Greek and Latin roots (sakkos/saccus). Just as in Spanish, this word primarily refers to a bag or container. We can also see this root in words like 'satchel' and 'sachet', which are different types of bags or pouches.