Note 1 — Chapter I · THE POPULUS AND ITS EARLIEST POLITICAL DIVISIONS
Reading edition
Cf. Mommsen, Röm. Forsch. i. 168 and n. 1. Schrader, Reallex. 920 f., accepts this explanation as most probable, and connecting it with Skt. cakrá-, interprets it as referring to a wheel formation of the army. But Vaniček, Griech.-lat. etym. Wörterb. 1085 f., connects populari with spol-iu-m.