There is quite simply no Vrinna in today Germany - the genealogical place
index does not help as well. Prussia in 1844 - 1848 is not only round
Berlin - it is much bigger for example including the Rhineland - and I do
not know what else.
Stofer - today you can find 24 in the online phonebook - most of them in the
region with postal-zip-codes beginning with 7....., some in 8....... and
some in 9......
(Baden-Wurttemberg, Bavaria = south Germany = not really Prussia)
Stople is no German name
Stopel - you can find 16 entries
You are looking for a needle in a haystack - and nobody knows how the needle
looks like.
Sorry
Try your american resources first - Census - Ellis Island - Immigration or
Naturalization Papers - old stories (letters) of the family - ask
relatives - or whatever - I don`t see any chance in Germany.