Daenerys Targaryen (to Unsullied): From this day forward, you will choose your own names. You will tell your fellow soldiers to do the same. Throw away your slave name. Choose the name your parents gave you, or any other. A name that gives you pride.

Grey Worm: "Grey Worm" gives me pride. It is a lucky name. The name this one was born with was cursed. That was the name he had when he was taken as a slave. But Grey Worm is the name this one had the day Daenerys Stormborn set him free.