“Then answered Dauid, and sayd to Ahimelech the Hittite, and to Abishai the sonne of Zeruiah brother to Ioab, saying, Who will goe downe with me to Saul to the campe? And Abishai sayd, I will goe downe with thee.”
1611 King James Version (KJV)
26:6 Zerujah - David's sister. His father is not named either because he was now dead; or because he was an obscure person.