Meaning

noun European herb somewhat resembling celery widely naturalized in Britain coastal regions and often cultivated as a potherb

noun king of Macedon; conqueror of Greece and Egypt and Persia; founder of Alexandria (356-323 BC)

originBorrowed from Latin Alexander, from Ancient Greek Ἀλέξανδρος (Aléxandros), from ἀλέξω (aléxō, “to defend”) + ἀνδρ- (andr-), the stem of ἀνήρ (anḗr, “man”). Doublet of Alastair, Alejandro, Iskandar, Sikandar, Alessandro, and Alexandre.

Etymology from Wiktionary, CC BY-SA 3.0