Banal
mid 18th century (originally relating to feudal service in the sense ‘compulsory’, hence ‘common to all’): from French, from ban ‘a proclamation or call to arms’; ultimately of Germanic origin and related to ban1.
wiktionary
Borrowed from French banal(“held in common, relating to feudal service, by extension commonplace”), from Old French banel, related to Medieval Latin bannālis(“subject to feudal authority”), from Latin bannus(“jurisdiction”), both ultimately from Proto-Germanic *bannaną(“order, summon, forbid”). See also ban, abandon.
etymonline
banal (adj.)
"trite, commonplace," 1840, from French banal, "belonging to a manor; common, hackneyed, commonplace," from Old French banel "communal" (13c.), from ban "decree; legal control; announcement; authorization; payment for use of a communal oven, mill, etc.," from a Germanic source, from Proto-Germanic *bannan "to speak publicly, used of different kinds of proclamations (see ban (v.)).
The sense evolved from the word's use in designating things like ovens or mills that were used in common by serfs, or else in reference to compulsory feudal military service; in either case it was generalized in French through "open to everyone" to "commonplace, ordinary," to "trite, petty." The word was earlier used in English with a sense "pertaining to compulsory feudal service" (1753). Related: Banalize; banalization.
