Both were named after the Battle of Plassey 1757, part of the British Conquest of India.
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The Battle of Giria were two battles that took place in Giria, an insignificant village in Bengal, although not well known, were very significant in the history of Bengal and like the Battle of Plassey, had far reaching consequences.
British governance of large swathes of Indian territory began with Robert Clive's victory over the Nawab of Bengal, Siraj ud-Daulah, at the Battle of Plassey in 1757.
The Residency system has its origins in the system of subsidiary alliances devised by the British after the Battle of Plassey in 1757, to secure Bengal from attack by deploying East India Company troops of the Bengal Army within friendly Native States.