When Hartford, Connecticut, entered the loop in 1938, the NY–PL adopted the Eastern League name, and has used that identity since (except for 2021, when it was known as the Double-A Northeast).
The New York–Pennsylvania League adopted the Eastern League name in 1938 when Hartford, Connecticut joined. They have maintained this identity since then, with a brief exception in 2021 when they were known as the Double-A Northeast.