polyonomy

There are those who deny this polyonomy, as Max Müller has called it, and who maintain that the names in the earliest Veda represented distinct deities; but, by similar reasoning, Professor Tiele and others insist that three different Hebrew Gods, according to their respective names, were worshipped in successive periods of the Jewish history.

Oriental Religions and Christianity A Course of Lectures Delivered on the Ely Foundation Before the Students of Union Theological Seminary, New York, 1891 Frank F. Ellinwood

The opinion of your correspondents, that instances of persons having more than one Christian name before the last century are, at least, very rare, is borne out by the learned Camden, who, however, enables me to adduce two earlier instances of polyonomy than those cited by J.J. H.:

Notes and Queries, Number 191, June 25, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. Various 1852