English: habitational name from Platt or Platt Bridge in
Lancashire, named in Middle English with Old French plat
‘flat’, ‘thin’ (see Platte), in the dialect sense ‘plank
bridge’.
English: topographic name from Middle English
plat ‘plot of land’, ‘piece of ground’ (Old English
plætt).
Jewish (Ashkenazic): nickname from German
platt ‘flat’.
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