New Revised Standard Version
But in the seventh month, Ishmael son of Nethaniah son of Elishama, of the royal family, came with ten men; they struck down Gedaliah so that he died, along with the Judeans and Chaldeans who were with him at Mizpah.

Contemporary English Version
Ishmael was from the royal family. And about two months after Gedaliah began his rule, Ishmael and ten other men went to Mizpah. They killed Gedaliah and his officials, including those from Judah and those from Babylonia.

New American Bible
But in the seventh month Ishmael, son of Nethaniah, son of Elishama, of royal descent, came with ten others, attacked Gedaliah and killed him, along with the Judahites and Chaldeans who were in Mizpah with him.

Douay-Rheims Bible
But it came to pass in the seventh month, that Ismael, the son of Nathanias, the son of Elisama, of the seed royal came, and ten men with him, and smote Godolias; so that he died: and also the Jews and the Chaldees that were with him in Maspha.

But it came to pass in the seventh month, that Ismael, the son of Nathanias, the son of Elisama, of the seed royal came, and ten men with him, and smote Godolias; so that he died: and also the Jews and the Chaldees that were with him in Maspha.

seventh.

Zechariah 7:5 Speak to all the people of the land, and to the priests, saying: When you fasted, and mourned in the fifth and the seventh month for these seventy years: did you keep a fast unto me?

Zechariah 8:19 Thus saith the Lord of hosts: The fast of the fourth month, and the fast of the fifth, and the fast of the seventh, and the fast of the tenth shall be to the house of Juda, joy, and gladness, and great solemnities: only love ye truth and peace.

Ishmael.

Jeremiah 40:15,16 But Johanan the son of Caree, spoke to Godolias privately in Masphath, saying: I will go, and I will kill Ismahel the son of Nathanias, and no man shall know it, lest he kill thee, and all the Jews be scattered, that are gathered unto thee, and the remnant of Juda perish. . . .

Jeremiah 41:1-15 And it came to pass in the seventh month, that Ismahel the son of Nathanias, the son of Elisama of the royal blood, and the nobles of the king, and ten men with him, came to Godolias the son of Ahicam into Masphath: and they ate bread there together in Masphath. . . .

royal.

2 Kings 11:1 Now Athalia, the mother of Ochozias, seeing that her son was dead, arose and slew all the royal seed.