‘Wan’ is (still) in modern Dutch a word that means something ‘bad’. ‘Wansmaak’ is ‘bad taste’ or ‘wantij’ is ‘bad tide’ (tides influenced by tidal streams). ‘Spedig’ is related to the modern Dutch word ‘spoedig’, which means ‘soon’, but the meaning changed from something like ‘good fortune’: ‘voorspoed’ is ‘properity’.
Old English Wordhord 
‘Wan’ is (still) in modern Dutch a word that means something ‘bad’. ‘Wansmaak’ is ‘bad taste’ or ‘wantij’ is ‘bad tide’ (tides influenced by tidal streams). ‘Spedig’ is related to the modern Dutch word ‘spoedig’, which means ‘soon’, but the meaning changed from something like ‘good fortune’: ‘voorspoed’ is ‘properity’.
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Interesting stuff!
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Prosperity is thus simply ‘prospedigness’.
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Shouldn’t the g in “spēdig” be silent due to palatalization?
(The MS is a mid-14th century speculum: Morgan M.456, or so Google tells me. Here it is: http://ica.themorgan.org/manuscript/112420)
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