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).
When Hartford, Connecticut, joined the league in 1938, the New York–Pennsylvania League adopted the Eastern League name, and has used this identity ever since (except for 2021 when it was known as the Double-A Northeast).