Maybe it's late to answer but I just looked today for a Joannes Verjans who went to the US with his family.
It seems (needs to be verified) that Joannes Verjans was born July 10, 1798 ("Jan" is the flamisch name for "Joannes").
I found an info on the net : Joannes is the son of Joannes and Agnes Nooben, he ha 6 children. His name became FERRIANS, it's just the english way to pronounce Verjans, and after that FERRIAN, his kids : John, William, Louis, August, Theodore, Alphonse. His wife (2d): Maria Gertrude FRANSEN. He arrived in NY, coming from Antwerp in 1862.
Why I'm a busy with that ?
My mother's name is... Verjans :)
Tell me please if you had an answer since 2003 :)