#patronymic root
- Andrzejewski — A Polish surname famous internationally, notably due to the writer Jerzy Andrzejewski, author of the landmark novel 'Ashes and Diamonds'. Structurally, this patronymic is formed from the given name Andrzej (Andrew) combined with the traditional suffix '-ewski', indicating family lineage or historical estate ownership in Eastern Europe.
- Andurca — An extremely rare Romanian surname or archaic regional minor toponym/hydronym, structurally derived from a variant of the name Andrew (Andru) or through local phonetic contamination. In Eastern European onomastics, this patronymic marks an isolated family identity preserved in old archives.
- Ardanovici — A Romanian family name (surname) with a restricted regional distribution, specifically encountered in eastern and northern areas characterized by Slavic influences or cultural borders. Structurally, it belongs to the category of patronymic names formed by appending the filiation suffix '-ovici' (son of...) onto a local or archaic onomastic root such as Ardan.