Rehum

A man, in the time of Exile and Return · named in 4 verses

the name means Merciful Easton's Bible Dictionary

Rehum was a Persian official who wrote to King Artaxerxes, attempting to stop the rebuilding of Jerusalem.

From Easton's Bible Dictionary

Merciful. (1.) One of "the children of the province" who returned from the Captivity (Ezra 2:2); the same as "Nehum" (Neh. 7:7).

Easton's Illustrated Bible Dictionary, 1897 — public domain, quoted in full and unedited.

First named at Ezra 4:8.

Ezra 4:8 Rehum the commander and Shimshai the scribe wrote the letter against Jerusalem to King Artaxerxes as follows:
Ezra 4:9 From Rehum the commander, Shimshai the scribe, and the rest of their associates—the judges and officials over Tripolis, Persia, Erech and Babylon, the Elamites of Susa,
Ezra 4:17 Then the king sent this reply: To Rehum the commander, Shimshai the scribe, and the rest of your associates living in Samaria and elsewhere in the region west of the Euphrates: Greetings.
Ezra 4:23 When the text of the letter from King Artaxerxes was read to Rehum, Shimshai the scribe, and their associates, they went immediately to the Jews in Jerusalem and forcibly stopped them.