Read... Rev 7: 4-8<quoted text>
If you take the 144,000 literal...then:
14 Then I looked, and there before me was the Lamb, standing on Mount Zion, and [[[[[with him 144,000 who had his name and his Fathers name written on their foreheads.]]]]]
They would literally have the Fathers name written on the foreheads in PLAIN sight.
These cannot be the tribes of natural Isreal because there never was a tribe of Joseph, the tribes of Ephraim and Dan are not included in the list here, and the levites were set aside for service in connection with the temple but were not reckoned as one of the 12 tribes. See numbers 1: 4-16.)