The BJP(its a political party) has BAPTISED the Ambetkar stadium as Deer Dayal Nagar,
while the CPI(another political party) has CHRISTENED the Talkalar stadium as E.K. Nayanar Nagar
I have only heard Christened used in this sort of way before, as a way of saying 'officially named'. Baptised seems a bit odd here. A nickname is an unofficial, often jokey, name.
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