You heard what he said. Fred.

Short for Winifred.

Romana: “Roman­ad­voratre­lundar.”

The Doc­tor: “By the time I’ve called that out, you could be dead. I’ll call you Romana.”

Romana: “I don’t like Romana.”

The Doc­tor: “It’s either Romana or Fred.”

Romana: “All right, call me Fred.”

So? She looks like a Fred!