The Spanish word 'berreta', meaning 'of poor quality' in Lunfardo (Argentine slang), comes from the Italian surname 'Beretta', which is famously associated with the Beretta firearms manufacturer. The semantic shift from the manufacturer's name to meaning 'poor quality' likely developed as slang in Argentine Spanish, possibly from counterfeit or low-quality firearms being referred to as 'berretas' in contrast to genuine Beretta products. This kind of semantic development, where a brand name becomes associated with inferior imitations, is relatively common in slang evolution.

As 'berreta' comes from a proper noun and is primarily used in Argentine slang (Lunfardo), there aren't any commonly used Spanish words that share its etymology.

While there aren't any English words etymologically related to 'berreta', English speakers might recognize 'Beretta' as the name of the famous Italian firearms manufacturer. The Spanish slang term took on a completely different meaning from this original proper noun.