The Spanish word 'gabacho' (a derogatory term for a French person) has interesting pre-Roman origins. It comes from the Occitan word 'gavach' meaning 'mountaineer' or 'person with goiter.' This Occitan term derived from the pre-Roman word 'gaba' meaning 'goiter' or 'throat.' The evolution of meaning is connected to the historical observation that people living in mountainous regions often suffered from goiter due to iodine deficiency in their diet. Over time, the term became specifically associated with French people in Spanish, taking on a pejorative connotation.

There aren't many common Spanish words directly related to 'gabacho' since it comes from a pre-Roman root that didn't produce many derivatives in Spanish.

There aren't any common English words directly related to 'gabacho' since it comes from a pre-Roman root that didn't make its way into English. However, English speakers might be interested to know that the medical term 'goiter,' while not etymologically related, refers to the same throat condition that gave rise to this term's original meaning.