Tars looks perplexed and then remembers, Edgar does not speak Thark. Someone in the Bar explained to him about the magical field that allows them all to understand one another, even if they're not speaking the same language. It must still be effecting the two of them.

"It is the name Tabras and his men have given you. I think it is a good name."

It's not the equivalent of My Right Arms, but it'll do for now.