Whose name is Minkowski 92 bearing? Minkowski 92 is a protoplanetary nebula. But after which Minkowski is it named? Same question for Minkowski's object (part of NGC 541).
Rudolf Minkowski.

Its not likely to be the mathematician, Hermann. Nor the physiologist Oskar.  There's only one Minkowski who was an observational astronomer.

The paper describing M1-92 was https://iopscience.iop.org/article/10.1086/125855

The 2006 paper on Minkowski's object (Croft et al) cites Minkowski, R. 1958, PASP, 70, 143