belfry

[13] Etymologically, belfry has nothing to do with bells; it was a chance similarity between the two words that led to belfry being used from the 15th century onwards for ‘bell-tower’. The original English form was berfrey, and it meant ‘movable seige-tower’. It came from Old French berfrei, which in turn was borrowed from a hypothetical Frankish *bergfrith, a compound whose two elements mean respectively ‘protect’ (English gets bargain, borough, borrow, and bury from the same root) and ‘peace, shelter’ (hence German friede ‘peace’); the underlying sense of the word is thus the rather tautological ‘protective shelter’. A tendency to break down the symmetry between the two rs in the word led in the 15th century to the formation of belfrey in both English and French (l is phonetically close to r), and at around the same time we find the first reference to it meaning ‘bell-tower’, in Promptorium parvulorum 1440, an early English-Latin dictionary: ‘Bellfray, campanarium’. => AFFRAY, BARGAIN, BORROW, BOROUGH, BURY, NEIGHBOUR

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   The word was originally the term for a moveable tower for attacking fortifications. Hence its origin in a word that literally means 'protective place of shelter,' from Germanic words related to modern German bergen, 'to save,' and Friede, 'peace.' When a similar building was used as a bell tower, the word became popularly associated with bell.