In case this answer is rejected because a cyborg is not a robot, here is a later story featuring a true robot named X1-2-200, or X1 for short.

1938: "X1-2-200", a short story by Ray Cummings, published in Astounding Science-Fiction, September 1938 (available at the Internet Archive), apparently never reprinted.

His name was X1-2-200. He was built in the Dyne Robot Factories; the date when his existence began was engraved on his fuse-box—Jan. 20, 2200. Old Elihu Dyne was present when the last motivating connection was made, for this was to be his personal servant—the highest type automatic machine his genius had produced.

X1 could barely remember his three months of preliminary training. It was a blur upon his brain-scroll. But he was dimly aware of the daylight hours on the big training field within the walled enclosure of the factory, where, with squads of other robots, they were taught to motivate at the spoken word—walking, running retrieving objects that the instructors threw for them.

In case this answer is rejected because a cyborg is not a robot, here is a later story featuring a true robot named X1-2-200, or X1 for short.

1938: "X1-2-200", a short story by Ray Cummings, published in Astounding Science-Fiction, September 1938 (available at the Internet Archive), apparently never reprinted.

His name was X1-2-200. He was built in the Dyne Robot Factories; the date when his existence began was engraved on his fuse-box—Jan. 20, 2200. Old Elihu Dyne was present when the last motivating connection was made, for this was to be his personal servant—the highest type automatic machine his genius had produced.

X1 could barely remember his three months of preliminary training. It was a blur upon his brain-scroll. But he was dimly aware of the daylight hours on the big training field within the walled enclosure of the factory, where, with squads of other robots, they were taught to motivate at the spoken word—walking, running retrieving objects that the instructors threw for them.