[beagle3]

J actually descended from A, Arthur Whitney (of K and Q fame). The famous origin of J[0] was called A at the time it was created, and Whitney developed it into an APL; A version with GUI was called A+ and was later GPLed[1]

[0] http://www.jsoftware.com/jwiki/Essays/Incunabulum

[1] http://aplusdev.org