1. relating to or having the same name or a name derived from the same root
Usage: formal; linguistics
2. of or relating to a cognomen (a surname or family name)
Usage: formal; historical

Examples

• The cognominal relationship between 'Philip' and 'Philippa' shows how names can share a common origin.
• In Roman times, cognominal distinctions helped identify family lineages.
• Linguists study cognominal patterns to trace the etymology of surnames across cultures.
• The cognominal forms of these words suggest they evolved from the same ancestral term.