EXAMPLES FROM THE WEB FOR UMP
Ump's bed had not been slept in, and there was about him the warm smell of a horse.
We followed him to the stable, Ump galloping like a great rabbit.
Ump was as sensitive as any cripple, and he was afraid of no man.
There were Ump and Jud, the two ferrymen, and their ancient mother.
Ump shouted to turn down into the eddy, and I swung El Mahdi around.
Peppers gulped a swallow, then he lowered his pitcher and looked at Ump.
Ump came along after the last of the cattle and burst into a great laugh.
He had doubtless cut the cable, as Ump had said, but his provocation had been great.
But I talked with Ump about it, and in the light of these after events it was tolerably clear.
The idea of resting the horse was so delicious that Ump and Jud laughed too.
short for umpire (n.), by 1915, American English.