Chemical symbol of elements in chemistry is derived from the first two letters or first letter and any other letter of its ENGLISH name OR its LATIN name. Since the LATIN name of Silver is ARGENTUM, hence its symbol is Ag.
What is the Chemical Symbol for Silver? | BullionByPost
The chemical symbol for silver is Ag, coming from the Latin word for silver – Argentum . Interestingly, it is the same root word for the French word argent , which means both silver and money, telling us a lot about the historical affinity between wealth and precious metals.