'frequently' originates from Latin, specifically the word 'frequentare,' where 'frequent-' meant 'crowded or repeated.' 'Recommend' originates from Latin, specifically the word 'recommendare,' where 're-' meant 'again' and 'commendare' meant 'to commit to the care of.'

'frequentare' transformed into the Old French word 'frequenter,' and eventually became the modern English word 'frequent.' 'Recommendare' transformed into the Old French word 'recommander,' and eventually became the modern English word 'recommend.'

Initially, 'frequent' meant 'crowded or repeated,' and 'recommend' meant 'to commit to the care of.' Over time, 'frequently-recommended' evolved to mean 'suggested often.'