Charles Ellicott Commentary Nehemiah 2:10

"And when Sanballat the Horonite, and Tobiah the servant, the Ammonite, heard of it, it grieved them exceedingly, for that there was come a man to seek the welfare of the children of Israel." — Nehemiah 2:10 (ASV)

Sanballat the Horonite. —Satrap of Samaria under the Persians, whose secretary or minister was “Tobiah the servant, the Ammonite.” Sanballat was from one of the Beth-horons, which had been in Ephraim, and were now in the kingdom of Samaria. His name is seemingly Babylonian, while that of Tobiah is Hebrew. The revival of Jerusalem would be a blow to the recent ascendency of Samaria.