I am afraid there is nothing you can do because it is not a misspelled word!
If it needs no editing, does it matter whether spellcheck recognizes words or not?
It is just indicating that word since it is not a part of normal vocabulary giving you chance to look it up since there are multiple Meinhard out there.
However:
On a Mac with OS X one can add or remove custom words which are located in the
~/Library/Spelling/LocalDictionary