Historically, the Aramaic alphabet became distinct from Phoenician/Paleo-Hebrew in the 8th century. After the fall of the Persian Empire, Judaism used both scripts before settling on the Aramaic form, henceforth de facto becoming the “Hebrew alphabet” since it was repurposed to write Hebrew. For a limited time thereafter, the use of paleo-Hebrew (proto-Samaritan) among Jews was retained only to write the Tetragrammaton, but soon that custom was also abandoned.
