John Gill Commentary Numbers 2:5

"And those that encamp next unto him shall be the tribe of Issachar: and the prince of the children of Issachar shall be Nethanel the son of Zuar." — Numbers 2:5 (ASV)

And those that do pitch next unto him [shall be] the tribe of
Issachar
Who with Zebulun, after mentioned, as placed with him under the same standard, were the brethren of Judah, by the same mother Leah, and so fitly put together, as most likely to continue in harmony and love; and being the youngest sons of Leah, and brethren of Judah, would, without any reluctance or murmuring, pitch under their elder brother's standard:

and Nethaneel, the son of Zuar, [shall be] captain of the children of
Issachar ;
see (Numbers 1:8) (7:18) .