No, it is a Maratha surname (Kshatriya).
No, Khairnar is not Brahmin Surname. It is Marathi Surname.
Yes Vaidya is Marathi Brahmin surname, but found in other castes too
No it is not.
Yes.
Yes. This some Deshastha Marathi brahmins hold surname Bhandari
Deshastha Brahmin
Deshastha Brahmin
No, it is a Bania/Vani surname, meaning it is a Vaishya surname.
The Surname Tatwawadi in Marathi are Hindu Brahmin (Deshastha).
Marathi Surname "Keskar" belongs to Dhangar caste as well as Brahmin caste.
Saraswat Brahmin
Kokanastha Brahmin