onomancy

From Ancient Greek ὄνομα (ónoma, “name”) +‎ -mancy. Compare nomancy.

onomancy (usually uncountable, plural onomancies)

1. divination by the letters of a name; nomancy

• “onomancy”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.