Vaishav caste and now under Obc B (napith) is a forward caste in wb
Kayasthha
Kayasta
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.
SIL International was created in 1934.
Narasingha Sil was born in 1937.
Karu-Sil was created in 2007.
Sil Austin was born in 1929.
Sil Austin died in 2001.
Point
Sanjit Sil goes by Tonkai.
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.