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    $\begingroup$ The Wikipedia page doesn’t say that, nor do the words “cardinal” or “cardinalis” appear in the quoted 1952 paper and 1953 book. $\endgroup$ Commented Jun 25, 2018 at 14:44
  • $\begingroup$ @FrancoisZiegler I stand corrected -- the text of the WIki page was rather misleading. I'll try to update my answer shortly $\endgroup$ Commented Jun 25, 2018 at 15:29
  • $\begingroup$ I think you’re right that the name “cardinal” for interpolation series goes back to Whittaker. But who first called the sinc function “cardinal sine” remains anyone’s guess. Whittaker (1915) certainly doesn’t, nor does Woodward imply that “c” is for cardinal. $\endgroup$ Commented Jun 25, 2018 at 19:11