Meaning

noun 11th President of the United States; his expansionism led to the Mexican War and the annexation of California and much of the southwest (1795-1849)

origin* As a Scottish surname, shortened from Pollock. * As a Upper Sorbian surname Półk, Pólk, probably shortened from a personal name based on Proto-Slavic *plъkъ (“army, crowd”), see Polka. * As an East German surname of Slavic origin, variant of Polke, itself from a Silesian form of Polish Bolesław.

Etymology from Wiktionary, CC BY-SA 3.0