Numbers 1:6

Modern

…from Simeon, Shelumiel son of Zurishaddai;

Traditional

Of Simeon; Shelumiel the son of Zurishaddai.

Literal

From Simeon, Shelumiel son of Zurishaddai.

Latin

…de Simeon, Salamiel filius Surisaddai;

Hebrew

English

…from Simeon, Shelumiel son of Zurishaddai;

those who are twenty years of age or older by their divisions—everyone who can serve in Israel’s army: This registration gathered more information than the earlier census (compare Exodus 38:26).
These are the names of the men who are to assist you: Hebrew culture was tribal, centered around clans and families. They easily identified the tribal leaders, who appear again as a group in Numbers 7.
Moses and Aaron did not include the tribe of Levi in this registration because it had a special status in Israelite society (see Numbers 1:47–53; 26:51–62; Deuteronomy 18:5; 33:8–11).

God chose a family leader from each tribe (except the tribe of Levi), to count Israel's men who were old enough to be soldiers.

Numbers 7:36
On the fifth day Shelumiel son of Zurishaddai, the leader of the Simeonites, drew near.
Numbers 2:12
The tribe of Simeon will camp next to it. The leader of the Simeonites is Shelumiel son of Zurishaddai,

Shelumiel: Leader of the tribe of Simeon Simeon: Son of Jacob and Leah, one of the twelve tribes Zurishaddai: Father of Shelumiel, leader of Simeon