From Wiktionary, the free dictionary
nach- + Name
Nachname m (weak, genitive Nachnamens, plural Nachnamen)
- last name; surname
- Coordinate terms: Familienname, Zuname
Declension of Nachname [masculine, weak]
- “Nachname” in Digitales Wörterbuch der deutschen Sprache
- “Nachname” in Uni Leipzig: Wortschatz-Lexikon
- “Nachname” in Duden online