He was popularly known as "Prince John" because of his manners and appearance.
Popularly, however, the emperor is known by his old Russian title of tsar.
In fact, he did so much to make the atomic theory of matter probable that he is popularly regarded as its originator.
He was popularly regarded as a prophet, more especially as a second Elijah.
The monitor lizard is popularly known as the goanna, a name derived from the iguana, an entirely different animal.