Roy or Rai or Ray is gifted title that is same as everywhere else in India. But, generally speaking, Roy lastnames are used by higher castes like Brahmins or Kayasthas in Bengal, they are being mostly from ruling communities in Bengal. But, you may also find Roy is used by people from lower caste like Namah-Sudra that belongs to so-called Scheduled Caste. In Bangladesh, you may even find Muslims bearing Roy lastnames. I have seen even converted Christian (or Anglo-Indian) using the same title. In general, you can expect a very higher percentage of people having Roy lastname belongs to Brahmin or Kayastha community, then probably few from SC, lastly Muslim or Christians using this title will be very rare occurance.
Kshatriya , Roy surname are used by sisodia Rajput clan
In West Bengal , Singh are use singha or Roy title.
Rana sanga are founder of singharoy , Roy.
Kayasthha
Kayasta
Vaishav caste and now under Obc B (napith) is a forward caste in wb
kulin kshatriya.they are the top most kshatriya in bengali community.
Sarkar is Persian word known as government. They served Islam and British as rulers.In india specially bengalis belong to caste Sarkar. Sarkars are bengali rajputanas. They are khatriya too but every khatriyas are not rajputs.
Kar refers to highly educated caste among bengalis...Infact more than 95% of kar's are h.s pas.....they are very intellectual....Their taste is very good for food....
They are Kshatriyas , they were generally residents of North India, Haryana, and bought to Bengal to fight the British Empire. Now they are Bengalis.
Mostly no as most of the Roy belongs to Brahmins or Kshatriya Brahmins in India as well as Bengal. Few of Roy may get in other caste mainly in Bengal, but they all have strong & higher root in society. A few Roy also may falls on Sch. Caste but they are belongs to pure Brahmins as their customs/ rituals are falls under Brahmin or Brahman system. Moral is that any Roy/ Ray belongs to minimum level of Zamindar group/ administrator.
Point
Das is the surname with variety, Das of Goswami Lineage are Brahmin, Das of Rajbangsi lineage are Kshatriya, Mahisya Das &Kayastha Das of vaishav and Bhuimali/Rabidas/Ruidas etc are sudra das.
The surname Roy belongs mostly to an upper, or higher, caste. However, the name has been found to be used in lower castes, as well, such as the schedule caste. Most of ROY/ RAY belongs to superior class, that's in sense of caste/ wealth/ education and their culture. It can be found in many community as few. Unless untill community had not being lifted their superiority, surname Roy/ Ray or Rai can not be achieved. Yes, few of them may comes under Schedule caste, but they are the victim and desendants of Pure/ real Brahmin and their community is combination of Kshatriya brahmins clan i.e. Kashyapa/ Gautama/ Shandilya/ Mirichi gotra.... and fact is that they does not believe on any inferiority. One can realise their superiority if they get support from financial as well as social..... Its a real tragedy of our society/ Nation.
Too Many