There is an interesting case of old unities remaining in use for centuries in Brazil: "arroba"

This is wikipedia in portuguese for arroba through Google Translator (good enough to understand, just consider "arrogance" = Arroba): https://translate.google.com.br/translate?sl=pt&tl=en&js=y&p...

Basically is a mass unit (in Brazil and Portugal), originated at the imperial system (with an arabic name ar-arub meaning "the fourth part") of 25 pounds. The times changed, but it is still used in our metricized society for livestock weight. But adapted to a rounded number in kilos, nowadays 1 Arroba = 1 kilogram.