A girl or woman.
"The teacher called Judy to the front of the class, and she answered quickly."
A diminutive of the female given name Judith, also used as a formal female given name.
"Many people do not realize that Judy is actually a common nickname derived from the name Judith rather than a standalone surname."
A surname, from given names.
Aircrew has radar/visual contact on the correct target, has taken control of the intercept, and only requires situation awareness information.
"The pilot called Judy to confirm they had visual lock on the enemy aircraft and were ready to engage without further navigation guidance."
The name Judy is a diminutive form of the Hebrew name Judah. It entered English as a familiar nickname derived from the biblical figure and later became an independent given name for women.