Grave markers are usually where I start my research on my ancestors. In most cases, from my personal experience, a woman's maiden name is not engraved on the markers. Usually her married surname is on the marker. Regarding what Tom said above, the name Marian though it does seem to be a female name but Marian is also a Czech male name so it is possible that maybe his family used the Czech/male version of the name. Its uncommon for Marian spelled as it is to be a male's name but not unlikely. Also, on FindAGrave, I believe the female's maiden name, if known, is italicized.
Hopefully that helped a little at least. Have a lovely day and best of luck researching!