From Proto-Semitic *ʾarbaʿ-. Cognates include Ge'ez አርባዕቱ (ʾärbaʿtu), Amharic አራት (ʾärat) and Tigrinya ኣርባዕተ (ʾarbaʿtä).
አርበዕ • (ʾarbaʿ)