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Chebyshev also has a famous inequality in probability.

Also known for his studies of quadrilateral meshes with equal edge lengths.

Also known for having lots of variant spellings of his name (https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6500167) due to every Latin-alphabet language having different conventions for transliterating from Russian.

That must be a real headache when counting citations.

Wikipedia (https://en.wikipedia.org/wiki/Pafnuty_Chebyshev) says "It is one of the most well known data-retrieval nightmares in mathematical literature."