'unknown name' is correct and usable in written English.
You can use it when the name of something or someone is not known. For example, "The man had an unknown name, but everyone called him Joe."
It is a small company with a large and mostly unknown name, Hugo Neu Schnitzer East.
Michele, an unknown name at the beginning of 2015, is now setting the fashion agenda.
"We're an unknown name, we're not a Calvin Klein name," Ms. Mullman said.
On the day I happened to get caller ID, it was July 13, I kept getting phone calls all day long saying unknown name, unknown number.
Meanwhile, attribution didn't matter any more than the unknown name of a bird that sang heart-piercingly, hidden in her parents' garden.
For fans looking for an unknown name that may swing the sport's biggest game, look no further than a name familiar to fans of pop music: Chris Brown.
The film, written and directed by an unknown named Shimizu Takashi, was hypnotic.
He was co-director of "The James Dean Story" (1957), along with a relative unknown named Robert Altman.
The more intimately scaled works represent a similar range of known and unknown names.
A young unknown named Pete Seeger came to sing his working-class folk songs.
The nominees are all women, some of them unknown names in publishing before their selection last month.
