isonymy

Noun

isonymy (countable and uncountable, plural isonymies)

1. The property of having the same name, especially the same family name.
   • This was reflected also in three types of measure of inbreeding: (1) close inbreeding recorded in ecclesiastical dispensations for marriages of relatives; (2) total inbreeding from pedigrees; and (3) inbreeding from marital isonymy.1985, Gabriel Ward Lasker, Surnames and Genetic Structure, →ISBN
   • The absolute isonymies calculated from them are given in Table 6, the relative isonymies in Table 7. Absolute and relative isonymies obtained from the remaining 1035 less common surnames are in Table 8 and Table 9, respectively.1992, Chinese Surnames and the Genetic Differences Between North and South China, page 42