By some sources, @ symbol dates from sixth century when monks used it to write a latin word "ad", which means "to" as a word for direction, they used it because they didn't want to mix it with A.D. - Their mark for the New Era.

In China, older generations name it "little mouse", while younger Chinese use word "at". In germany, it is "monkey's tail", in Italy and sometimes in France, it is named "snail". 

In English, there is no unique name for the sign, so they tried to use a French word "arobas" or the Spanish and Portuguese "aroba" which is an old unit for measurement, but none of them was popular enough. 

In Czech Republic, they use word "zavinac" which is a name for some type of a salty fish. They also have a TV show that is named that way, and it is about Internet. 

"Rolled or circled A" is a term used in Bascian language. In Danish it is "elephant's trunk", and the Finish name it "cat's tail". 

In Greece and Cyprus they call it "duck" and in Hungary, they use the term "kukac", which means "Worm". The German people mostly use English "at", but they also use "Klammeraffe", because it looks like a tail of spider-monkey that it uses for climbing trees.