🔼The name Shelumiel in the Bible
There's only one man named Shelumiel in the Bible. He was a son of Zurishaddai and also the tribal leader of the tribe of Simeon. When YHWH ordered the first census of Israel, Shelumiel was appointed by the Lord to represent the tribe of Simeon (Numbers 1:6). Shelumiel was also his tribe's leader when Israel's army was organized (Numbers 2:12 and 10:19), and when donations for the tabernacle service were collected (Numbers 7:36-41).
🔼Etymology of the name Shelumiel
The name Shelumiel consists of two (or three) elements, the final one being אל (El), the prominent Canaanite deity, whose name became applied to the God of Israel, or the common abbreviation of Elohim, the genus God:
The first part of our name comes from the verb שלם (shalem), meaning to be unbroken or whole:
In between these two elements sits the letter י (yod), which may either turn the shelum-part of our name into an adjective (peaceful or at peace), or it turns the shelum-part into a possessive form (my peace, or peace of)
For a meaning of the name Shelumiel, NOBSE Study Bible Name List takes the yod to be an adjective-maker and reads At Peace With God.
Alfred Jones (Dictionary of Old Testament Proper Names) sees a possessive form created by the yod and proposes Friend Of God (although the meaning of "to be a friend" is not very prominent in the verb שלם (shalem), and should be avoided when expounding names).
BDB Theological Dictionary gives no explanation of the name Shelumiel but does list it under the verb שלם (shalem).