Kumar is a title mainly found in India, Bangladesh and Nepal denoting prince, referring to sons of a Raja, Rana, Babu or Thakur.
It is synonymous to the Rajput title Kunwar.
[1][2][3] The south Indian version of the title is Kumara.
[4] The female version is Kumari.
When there are more than one, the heirs are referred by their order in precedence i.e. First Kumar of Blank, Second Kumar of Blank & c.[5][6]