Scroll down to index, Check the gotram, scroll down to that group and you can see the entire list
of descendants of gotras and pravaras.
The kevalaas are also listed. That is, those who are brahmins, moved to practise kshatriya work and then returned to the brahmin roots.
Ten in all. Such as Garga, Moudgalya, Sankriti,...etc.
Also, the 2-family ones are explained. [ dvyaamushyaayanaas ]
Say, for instance, Sankriti.
Sankriti, one born to Shakti, son of Sage Vasishta, practise the work of kshatriyas, then return to brahmin roots (original vasishta gotra) by first
moving to the ashram of Sage Angeeras and then returning to their Root Vasishtar.
Two more Sankriti lines are Sage Aangeerasa line. One as direct descendant (angeerasa, gauriveeta, sankrutya)
and another the Kshatriya Sankriti (angeerasa, saankrutya, gauriveeta), who by way of having been born as a result
of the Yajna by Aangeerasar for a king, become Sage Aangeerasar's disciples, move with him to his ashram and take his gotra line.
The listing of kshatriyas and vaishyas too, is to be seen. One page listing. They have only one to three gotras/pravaras. The remaining have taken the
gotras of their family priests/gurus.