Clapp, or Clap, is an English surname, most commonly found in the West Country and in the United States. The word signifies rough ground, or a small hill - and was probably chosen for sounding silly by Bellairs.
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Father Burgerbitz • Modine Clapp • Mrs. L. S. D. • Benozzo Gozzoli • M. Fiorello • Gertie Frem • Mrs. A. M. • Aunt Min • Mrs. Annie Rugg • I. H. Samsonite • Purina Sansfoy • Septa Tanqueray • Becky May Tipover • Mr. Arthur "Dutch" Wolohan