10 in the order of their birth—six names on one stone and the remaining six on the other.

Read Exodus 28:10 Using Other Translations

Six of their names on one stone, and the other six names of the rest on the other stone, according to their birth.
six of their names on the one stone, and the names of the remaining six on the other stone, in the order of their birth.
Six names will be on each stone, arranged in the order of the births of the original sons of Israel.