Verb

Middle English bannen "to summon (troops) by proclamation, assemble (an armed force), gather (arms), curse, anathematize, prohibit, outlaw," going back to Old English bannan (class VII strong verb) "to summon by proclamation, call to arms," going back to Germanic *bannan- "to speak formally, call on, order" (whence also Old Frisian bonna, banna "to call upon, command, place under a ban," Old Saxon & Old High German bannan "to summon, order," Old Norse banna "to prohibit, curse"), going back to Indo-European *b^ho-n-h₂-e-, presumed o-grade intensive derivative (with gemination from a present formation with *-nu̯-e-?) from a verbal base *b^heh₂- "speak, say," whence also Latin for, fārī "to speak, say," Greek phēmí, phánai, Armenian bay "(s/he) says, speaks," and with extensions Eastern Church Slavic baju, bajati "to tell (stories), cast a spell, cure," Bosnian-Croatian-Serbian bȁjati "to tell tales, practice sorcery," Sanskrit bhánati "(s/he) speaks, says, (it) sounds"

Noun (1)

Middle English ban, bane, banne "proclamation by an authority, summons, one of the marriage banns, troop of warriors summoned by their overlord," in part noun derivative of bannen "to summon (troops) by proclamation," in part borrowed from Anglo-French ban, baan "proclamation, edict, jurisdiction, one of the marriage banns" (also continental Old French, "summons to arms by a lord, proclamation commanding or prohibiting an action"), going back to Old Low Franconian *banna-, going back to Germanic (whence also Old Frisian bon, ban, bān "order commanding or prohibiting under pain of a fine, authority, summoning of the army, banishment," Old Saxon bann "command, summons, fine, excommunication," Old High German ban "command by an authority, order, legal extension or withdrawal of protection"), noun derivative of *bannan- "to speak formally, call on, order" — more at ban entry 1

Noun (2)

Romanian, money, coin, small coin