Abishai

• Abishai — אֲבִישַׁ֨י aviyshay “[my] father is Jesse or father exists” (H52) · Αβεσσα Abessa — 1 Samuel 26:6
• Abshai — אַבְשַׁ֛י abəshai “[my] father is Jesse or father exists” (H52) · Αβεσσα Abessa — 1 Chronicles 2:16
• Ishmaiah — יִשְׁמַעְיָה yishəmaəyah “y-h-v-h heard” (H3460) · Σαμαιας Samaias — 1 Chronicles 12:4

• brother of Joab (son of Zeruiah, commander of David's army)
• brother of Asahel (brother of Joab and Abishai, sixth of "the…) (inferred)

Named in the same verse. A co-occurrence recorded by the text, not a claim that this person was there.

• Ammon — 3 shared verses
• Gibeon — 3 shared verses
• Ammah — 1 shared verse
• Edom — 1 shared verse
• Gath 1 — 1 shared verse
• Gederah 2 — 1 shared verse
• Giah — 1 shared verse
• Jerusalem — 1 shared verse
• Syria 1 — 1 shared verse
• Valley of Salt — 1 shared verse

• 1 Samuel 26:6
• 1 Samuel 26:7
• 1 Samuel 26:8
• 1 Samuel 26:9
• 2 Samuel 2:18
• 2 Samuel 2:24
• 2 Samuel 3:30
• 2 Samuel 10:10
• 2 Samuel 16:9
• 2 Samuel 16:11
• 2 Samuel 18:2
• 2 Samuel 18:5

and 12 further references.

• Son of Zeruiah, David's sister — 1 Chronicles 2:16
• One of David's chief men — 2 Samuel 23:18
• Seeks Saul's life — 1 Samuel 26:6
• Pursues and kills Abner — 2 Samuel 2:24; 2 Samuel 3:30
• Defeats the Edomites — 1 Chronicles 18:12
• Defeats the Ammonites — 2 Samuel 10:10; 2 Samuel 10:14
• Seeks the life of Shimei — 2 Samuel 16:9; 2 Samuel 19:21
• Leads a division of David's army against Absalom — 2 Samuel 18:2; 2 Samuel 18:5
• Overthrows Sheba — 2 Samuel 20:1
• Saves David from being slain by a Philistine — 2 Samuel 21:17
• Obtains water from the well of Bethlehem for David — 1 Chronicles 11:15

Outline from Nave's Topical Bible (1897); the sub-headings are Nave's own.