Likely gimei

[jesup]

I would assume if I see a wakizashi blade with

相模國住人貞宗 sagami(?) kuni junin sada mune(?) and a date from gen toku(?) 2 (1331), with a tang that looks late koto/early edo, it's gimei.... :-)   Maybe I misread the date and it's Genroku, which would make more sense... but there are no sadamune's anywhere near that.  And no Sadaxxxx's in that timeframe that signed in a way that matches, at least from https://nihontoclub....&mei=kuni+junin+sada

[Kanenaga]

No signed Sadamune.

[jesup]

I was assuming https://nihontoclub.com/smiths/SAD543,

And thus certainly gimei if it's a wak that looks to be early edo or late koto.