An Etymological Dictionary of the German Language/Wanze
Appearance
Wanze, f., ‘bug,’ from the equiv. MidHG. wanze, f. The word first appeared in the 13th cent.; in MidHG. and OHG. the term wantlûs, ‘house-bug,’ is used in the same sense; probably Wanze is an abbreviation of the latter (comp. Spatz with Sperling). For the meaning comp. Czech stěnice, ‘bug,’ from stěna, ‘wall.’