The Spanish word 'gárgol' comes from Hispano-Arabic 'gárgal', meaning 'empty' or 'hollow', which in turn derives from Classical Arabic 'garqala', meaning 'to be empty' or 'hollow'. The word maintained its basic meaning throughout its evolution, though in Spanish it became specifically used to describe empty or hollow nuts and eggs.

While 'gárgol' is a relatively uncommon word in modern Spanish, it's worth noting that the similar-sounding word 'gárgola' (gargoyle) is more common, though it has a different etymology, coming from French 'gargouille'.

There aren't any common English words directly related to 'gárgol' through the Arabic root. However, English speakers might find it interesting that the word's meaning of 'hollow' is somewhat reflected in its sound, as the 'gar' syllable can evoke a sense of emptiness or hollowness, similar to how we might describe a gargling sound.