In your discussion of the Germanic zweibach or zwiebach, you reported that they came from the same root. In English we have a complicated rule for selecting ie or ei. "'I' before 'e', except after 'c' or in sounding like 'a' as in neighbor and weigh." Clearly there are very different (and complicated) meanings associated with the pronunciation of "ie". I simplified the words of Germanic origin. I pronounce the word making the second vowel long. So I say to myself, "Zweibach is nice, although zwiebach is sweeter." Am I wrong?