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.
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.
The Basak caste among Bengalis is traditionally associated with the Vaishya or merchant class. They are primarily involved in trade and business activities. The caste is considered to be part of the broader group of "Bengali Hindu" communities, and their status can vary regionally. In some contexts, Basaks may also be linked to the agricultural or farming sectors.
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.
The Roy caste, primarily found in parts of India, is often categorized under different classifications depending on the region and community context. In some areas, individuals from the Roy caste may be recognized as Scheduled Castes (SC), while in others, they may not be. It's essential to refer to local government notifications or documents for specific classifications, as these can vary significantly across states.
In Bengali society, "Dey" is typically associated with the Brahmin caste, specifically as a sub-caste. Brahmins in Bengal are often involved in religious and scholarly activities. However, it's important to note that caste distinctions can vary and may not be strictly adhered to in contemporary society, with a growing emphasis on egalitarian values.
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.
The Singh Roy surname is typically associated with the Bengali Hindu community, particularly among the landowning and zamindar classes in West Bengal and Bangladesh. While caste classifications can vary, individuals with the Singh Roy surname are often considered to belong to the higher castes, specifically the Kshatriya or Rajput groups. However, caste status can differ based on regional and familial contexts, so it is essential to consider local variations.
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.