Hitchin is in Herts, but the only Wallser names in either Herts or Beds on the IGI don't look right. Only two in Beds too late (one of whom I think must be the daughter of your Thomas having looked at your earlier posts) and four in Herts too early.
Hitchin parish register has been extracted onto the IGI and there's no baptisms showing
David
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Census information is Crown Copyright, from www.nationalarchives.gov.uk Beds: Cople: Luke/Spencer Everton: Hale Henlow: Cooper/Watts/Sabey Potton: Merrill Southill: Faulkner/Litchfield/Sabey Woburn/Husborne Crawley: Surkitt Hunts: Gt Gransden: Merrill/Chandler/Medlock Toseland: Surkitt/Hedge/Corn Cambs: Bourn: Bowd Eltisley: Medlock Graveley: Ford/Revell