isonymy

iso- +‎ -onymy

isonymy (countable and uncountable, plural isonymies)

1. The property of having the same name, especially the same family name.
   • 1985, Gabriel Ward Lasker, Surnames and Genetic Structure, →ISBN:

     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.

   • 1992, Chinese Surnames and the Genetic Differences Between North and South China, page 42:

     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.

   • 2012, James Mielke, Current Developments in Anthropological Genetics: Volume 1, →ISBN:

     Undoubtedly the most serious problem encountered in using isonymy data is “polyphyletism”: surnames often have multiple ancestral origins, which means that many isonymous marriage partners can be unrelated.

   • 2013, Roger Swift, Sheridan Gilley, Irish Identities in Victorian Britain, →ISBN, page 41:

     Our final test of the methods robustness is to make a direct comparison between the census evidence and the isonymy evidence about migrant origins.

• isonym