Root of all the chhetris in nepal apart from few like Rathore, tandon  etc is Karnali region. If somebody says Sirupali Basnets came  from Rajsthan then it's just their self-appeasement to be superior to other chhetris (because after getting higher posts in society and army chhetris hated to be called as of khas origin). And, Shahs first emerged as king in Bhrikot near Syangja then migrated to Lamjung and Nuwakot but not gorkha. It is evident by the fact shahs have one of prime kul devi in Syangja, AALAM DEVI. According to Dor Bahadur Bista, Shahs were the inhabitant of Gandak region, may be hybrid of Magars and Khas. It is evident by the fact all the temples erected by Shahs have magars as priest.  But, to be superior they connected their lineage to the rajasthani rajpoot of ujjain/ chittaur. This is not a fact. So is in the case of Basnyat, Ranas and other Chhetris. All of them are khas, a nomadic group that entered Karnali region in distant past  from persia and adopted Hinduism only after 14th century (They practiced Masta pooja, shamanism, and buddhism: you can find wealth of evidence on this in Dullu and Sinja area of Dailekh and Jumla ). If Basnyat are rajasthani rajpoot why they worship Khapar and other MASTAS, local deity of khas people of Karnali. These Mastas have nothing to do with Hinduism and rajpootana. Since Manusmrite calls khas as rustic and uncivilized hilly people, after adopting hinduism during the rule of Jumli king Baliraj Shahi khas people who attained major posts in government and army started feeling embarrased to be known as khas. They started calling themselves descendants of rajsthani rajpoot.

Rana-Kunwar who call themselvs as descendant of mewad rajpoot is not a truth. They were Khadka of Jumla who migrated to Kaski to join army and because of their valor kaskeli king honored them with the surname Kunwar (to equate indian kunwar rajpoot).
It's not only in the case of Khas, but also in magars. You can see rajpootana surname such as Chauhan, Sen, etc both in chhetris and magars. Do you believe chauhan magars came from madhyapradesh or rajsthan???