Many people would be aware that Manu, like Indra, is not the name of a person but a title that is passed on to different people from time to time (to be specific, after a Manvantar). It is also believed that the Vedas have come down to us unchanged from the beginning of time. So ideally, judging by their eternal nature, they should not contain the names of different people holding the same title since that would point to interpolations at different times.
However, an article on this site mentions that Rigveda gives the names of the following historical Manus:
Saaryaata Maanava RV 10-92
Cakshu Maanava 9-52, 9-106-4
Manu Vaivasvata – 8-5, 8-27-31
Manu Samvrana 9-49, 9-101-10
Manyu Tapasa – 10-67, 10-83,84
I could not find any reference to these Manus in the said verses so I would like to know if the various Manus of previous eras are indeed mentioned in any of the Vedic verses.