John Gill Commentary Numbers 36:11

"for Mahlah, Tirzah, and Hoglah, and Milcah, and Noah, the daughters of Zelophehad, were married unto their father`s brothers` sons." — Numbers 36:11 (ASV)

For Mahlah, Tirzah, and Hoglah, and Milcah, and Noah
The names of the daughters of Zelophehad, and the same as in (Numbers 26:33) (27:1) , only the order a little varied, Tirzah and Noah here changing places; there they are according to their birth, here they are according to their marriage, as Aben Ezra thinks; though Jarchi is of opinion, that being thus differently placed shows that they were equal to one another, and one was not preferred to the other:

these were married unto their father's brothers' sons ;
so that they were first cousins.