Tub
Middle English: probably of Low German or Dutch origin; compare with Middle Low German, Middle Dutch tubbe .
wiktionary
From Middle English tubbe, tobbe, from Middle Dutch tubbe or Middle Low German tubbe, tobbe, further etymology unknown. Considered to be unrelated to tube [1].
etymonline
tub (n.)
"open wooden vessel made of staves," late 14c., from Middle Low German, Middle Dutch, or Middle Flemish tubbe, of uncertain origin. Related to Old High German zubar "vessel with two handles, wine vessel," German Zuber. Considered to be unrelated to Latin tubus (see tube (n.)); one theory connects it to the root of two based on the number of handles. Also 17c. slang for "pulpit;" hence tub-thumper (1660s) "speaker or preacher who thumps the pulpit for emphasis."
