Sometimes tracking down a spouse information is hard if you only have little information to go on. I have quite often come across this, trying to tracking a spouse name or other information. I have found some of the following methods useful.
If you only have a last name, I have frequently come across this, where I will found a death record that listed the married name, but not the spouse name.
For example, Death record of Sarah Jones listed her married name as Peters but no spouse first name.
This is where if you have grave information, you can sometimes track down the spouse by searching the cemetery records for that last name.
For example, Sarah Peters Nee Jones was buried at Headman’s Cemetery in Toronto, Ontario, Canada. Then I would search the cemetery for Peters and then narrow down the field by focusing on those born in and around Sarah’s birth date. I then try searching for marriage between Sarah and the possible matches. If found I have found the spouse.
Another option is, if pictures are available, is comparing graves pictures for similarities. IE-similar stones or similar colors.
Also if you know for example that Sarah died in Rexdale, Toronto, Ontario in 1918 and was born in 1845. You could try searching for Peters that died in Rexdale, Toronto, Ontario born in around the same time as Sarah.
These methods are very much a trial and error but I have had quite a bit of success with them.
As Always, Thanks for Reading