Drusilla. She was Jewish and the youngest daughter of Herod Agrippa I. Her brother was Agrippa II. She was about 20 years old.

Simply Herod or Herod the king.

Agrippa is his surname : Marcus Vipsanius Agrippa . He was one of the great men in Roman history. Without him, Augustus would have failed. Incidentally, he was a good friend of Herod the Great and Herod named his grandson, Herod Agrippa after him.

Actually there were several Herods, as Herod didn't refer to just one person, but an entire family. Some of them were Agrippa I, Agrippa II, ANTIPATER I, ANTIPATER II, HEROD THE GREAT, JOSEPH, PHERORAS, ALEXANDER, ARISTOBULUS, HEROD King of Chalcis, AGRIPPA I King of Palestine, AGRIPPA II King of Chalcis, HEROD PHILIP, ARCHELAUS King of Judea.

Herod Agrippa I had James the brother of John killed (Acts 12:1-3). This Agrippa was the son of Bernice and Aristobulus, a son of Herod the Great.