These are the names of men. See how you translated Joab and Zeruiah (Joab's mother) in [2 Samuel 2:13](../02/13.md). (See: [[rc://en/ta/man/translate/translate-names]])
This word means that the person is descended from Ishmael. Some versions say "Israelite" here. See the footnote. You may want to choose the word that is used in the majority language Bible in your area.
This is a polite way of speaking of sexual relations. You may have to use other words in your translation. Alternate translation: "who had sexual relations with Abigail" (See: [[rc://en/ta/man/translate/figs-euphemism]])