cognomen
cog·no·men
noun
1.
2.
the name used to identify the members of a family (as distinguished from each member''s given name)
Origin
From Latin cognōmen, from con- (“with”) + nōmen (“name; family name”).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.