No, not all 12 apostles were Hebrew. According to the New Testament, Jesus chose 12 apostles to be his closest followers and to spread his message. The majority of the apostles were Hebrew or Jewish, but there were a few who were not.

The 12 apostles are traditionally identified as Peter, Andrew, James, John, Philip, Bartholomew, Matthew, Thomas, James the son of Alphaeus, Thaddaeus (also called Judas, not Iscariot), Simon the Zealot, and Judas Iscariot.

Of these 12, Peter, Andrew, James, John, and possibly Matthew were Hebrew or Jewish. However, Philip is believed to have been Greek, while Bartholomew (also known as Nathanael) is thought to have been from Cana in Galilee. Thomas was also known as “Didymus” and is believed to have had a Greek name. James the son of Alphaeus and Thaddaeus are also believed to have been Jewish, but little is known about their background. Simon the Zealot may have been a member of a Jewish nationalist movement, but his background is also unclear.

Overall, while the majority of the apostles were Hebrew or Jewish, there were at least two apostles who were likely of non-Hebrew origin.