Boyd’s Bible Dictionary:

(bringing rectory). Eldest daughter of Herod Agrippa (Acts 12:11Now about that time Herod the king stretched forth his hands to vex certain of the church. (Acts 12:1)), and sister of the younger Agrippi (Acts 25:13-23; 26:3013And after certain days king Agrippa and Bernice came unto Caesarea to salute Festus. 14And when they had been there many days, Festus declared Paul's cause unto the king, saying, There is a certain man left in bonds by Felix: 15About whom, when I was at Jerusalem, the chief priests and the elders of the Jews informed me, desiring to have judgment against him. 16To whom I answered, It is not the manner of the Romans to deliver any man to die, before that he which is accused have the accusers face to face, and have licence to answer for himself concerning the crime laid against him. 17Therefore, when they were come hither, without any delay on the morrow I sat on the judgment seat, and commanded the man to be brought forth. 18Against whom when the accusers stood up, they brought none accusation of such things as I supposed: 19But had certain questions against him of their own superstition, and of one Jesus, which was dead, whom Paul affirmed to be alive. 20And because I doubted of such manner of questions, I asked him whether he would go to Jerusalem, and there be judged of these matters. 21But when Paul had appealed to be reserved unto the hearing of Augustus, I commanded him to be kept till I might send him to Caesar. 22Then Agrippa said unto Festus, I would also hear the man myself. To morrow, said he, thou shalt hear him. 23And on the morrow, when Agrippa was come, and Bernice, with great pomp, and was entered into the place of hearing, with the chief captains, and principal men of the city, at Festus' commandment Paul was brought forth. (Acts 25:13‑23)
30And when he had thus spoken, the king rose up, and the governor, and Bernice, and they that sat with them: (Acts 26:30)

Strong’s Dictionary of Greek Words:

from a provincial form of 5342 and 3529; victorious; Bernice, a member of the Herodian family
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

bear thou victory

Potts’ Bible Proper Names:

Bringing victory; victorious:―eldest daughter of Herod Agrippa, Acts 25:13. {Reportans victoriam}