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onomancy

noun
on·​o·​man·​cy | \ˈänəˌman(t)sē, ōˈnämənsē\
plural -es

Definition of onomancy 

: divination from the letters of a name

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History and Etymology for onomancy

obsolete French onomancie, from Middle French, irregular from Greek onoma name + Middle French -mancie -mancy

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