Romanian word cognomen comes from Proto-Indo-European *ǵneh₃-, Latin con, Latin *conosceo, and later Proto-Indo-European *ǵn̥h₃sḱéti (To recognise.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *ǵneh₃- | Proto-Indo-European (ine-pro) | |
| con | Latin (lat) | |
| *conosceo | Latin (lat) | |
| *ǵn̥h₃sḱéti | Proto-Indo-European (ine-pro) | To recognise. |
| *gnōskō | Proto-Italic (itc-pro) | Know, get to know. |
| gnosco | Latin (lat) | |
| nosco | Latin (lat) | I know, recognize, am acquainted with, i.e.; in possession of knowledge. |
| cognoscere | Latin (lat) | |
| cognomen | Latin (lat) | An additional name derived from some characteristic. Surname. Third part of a formal name. |
| cognomen | Romanian (ron) |