Albert Barnes Commentary 1 Samuel 14:50

"and the name of Saul`s wife was Ahinoam the daughter of Ahimaaz. And the name of the captain of his host was Abner the son of Ner, Saul`s uncle." — 1 Samuel 14:50 (ASV)

The only other "Ahimaaz" mentioned in Scripture was the son of Zadok the priest. The word "Ahi" (brother) is frequently found as part of names in the High Priest’s family, for example, in Ahijah and Ahimelech. It is not improbable that Ahimaaz may have been of this family, since marriages between the royal and priestly houses were not unusual (2 Kings 11:2; 2 Chronicles 22:11).

Perhaps it was because of such a connection that Ahijah was brought into prominence by Saul. If there is any truth in this supposition, it would indicate that Saul was not married until after his election to the throne.