Abishai [heb] Abshai
1 Chronicles 11:20 And Abishai the brother of Joab, he was chief of the three: for lifting up his spear against three hundred, he slew them...
1 Chronicles 18:12 Moreover Abishai the son of Zeruiah slew of the Edomites in the valley of salt eighteen thousand.
The variation of () Abishai, and () Abshai is simply caused by the elision of (), {yood} which is by no means uncommon.
and they set
1 Chronicles 19:9 And the children of Ammon came out, and put the battle in array before the gate of the city...