I am distantly related to the MO Ehrharts. My GGrandmother was Ella C. Ehrhart and she married Thomas F. Grace. Ella could be her full name or it could be short for Eleanor or Elizabeth. I've been trying, unsuccessfully, to trace her siblings and parents. She lived in both MO and KS. She had nine children Tom(twin),Mary Ellen(twin), Donald, Patricia, Alice, Bernard(triplet), Bernadette(triplet), Bernadine(triplet), and Virgil Leo . Does this sound familiar to you? As far as the name goes, I think the crest can be found under the name Ehret. Good Luck.