Yes they are from the same caste
Chandra is not a caste. But many Vaisya and Kayasth use this as surname. It is more like a middle name. Like Kumar. But Vaisya and Kayasth in U.P. are using it to disguise their caste and get reservation benefit as O.B.C. It is same in Bihar, there also Vaisya(Bania) are using kUMAR(not a surname but middle name) to hide their upper caste identity and get reservation benefit under O.B.C. Only difference is in U.P. very few lower caste in U.P. use Chadra so it is easy to tell they are upper caste but in Bihar lots of lower cast use Kumar so it is very hard to tell persons caste.
No, ofcourse not. They are a subcaste to khatri (punjabi: meaning kshatriya) caste. Kind of same as Kapoor. So infact they are upper caste.
NO
No
Yes, they share the same gotras as brahmin gotras.
gujar caste kaun si comunity me aate hai
Bikkina & Bikkani (both are same) belongs to Kamma caste
Yes they are same these are both of Kurmi, Hinduism Caste..mainly in Jharkhand, W.Bengal, Orissa & Bihar.
Thandan and Thiyya castes. are different thandan caste is the name also used as a synonym for another distinct caste group, being the Ezhavas of the same region.
Napa or any surname is belongs to "Human" caste. Please do not see caste/religion/race. All human beings are born in the same way but why the hell caste/religion came. Caste/religion are created to guide the human beings to live better life not for marrying the girl in the same religion/caste.
Nope. Hatagar caste in karnataka comes under lingayat. and hatkar caste in maharastra comes under Dhangar
No.