'popularly-believed' originates from the combination of 'popularly,' derived from the Latin 'popularis,' meaning 'of the people,' and 'believed,' from the Old English 'belȳfan,' meaning 'to have faith or trust.'

'popularly-believed' evolved from the combination of 'popularis' and 'belȳfan,' eventually forming the modern English term 'popularly-believed.'

Initially, it meant 'widely accepted by the people,' and this meaning has largely remained the same in modern usage.