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I recently come across the oxaacids of Sulphur and got to know to Acids, $\ce{H2S2O8}$ and $\ce{H2SO5}$ as Marshall's Acid and Caro's Acid respectively, but I am just eager to know why they are named respectively so.

I tried searching in Google and couldn't found any relevant information regarding the same.

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    $\begingroup$ It is named after respective chemists who discovered it. $\endgroup$ – Nilay Ghosh Jun 4 at 13:59
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    $\begingroup$ @NilayGhosh, It is not necessary that they "discovered" it. You will have to check the original papers from 1890s! In the very first line he says that Bertholet described it initially. $\endgroup$ – M. Farooq Jun 4 at 17:36
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If you are curious about word or name origins like I am, get hold of two books:

  1. Elsevier's Dictionary of Chemoetymology: The Whies and Whences of Chemical Nomenclature and Terminology
  2. Alex Nikon's Organic Chemistry The Name Game.

In older times, it was pretty common to name a compound after a person who described the preparation or because nobody knew the structure. Nothing unusual about it. Here is the entry:

Caro’s acid:$\ce{H2SO5}$, named for the German chemist Heinrich Caro (1834-1910)

Marshall’s acid: $\ce{H2S2O8}$, named for the 19th century Scottish chemist Hugh Marshall

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