I have photos of a bunch of royal families, so I organize mine by country, then in each of those folders I have a folder for each person that has a lot of images by themselves (for example, Olga Nickolaievna may have her own folder, but Anastasia Mikhailovna might not). I place the women in folders based on country of birth, not where they married in to. I title their folder with their name and their title after marriage, so I can identify them quickly.
If I have a lot of photos of a group of people (for example OTMA, or ones of Alix and Dagmar together, etc.) I put those in their own folder.
If I have a lot of photos of a certain family (for example different combinations of OTA, TMA, etc., or the children of King Christian IX) I have a folder for that family.
So an example from mine would be: Denmark -
- AD (Alexandra and Dagmar together)
- Alexandra Queen of the United Kingdom
- Christian IX (pics of his family)
- Frederick III (family)
- Ingeborg Princess of Sweden
- Maria Feodorovna Empress of Russia
- Thyra Duchess of Cumberland
I have folders organized in this way for: Austria, Belgium, Brazil Spain and Portugal, Bulgaria Serbia and Montenegro, Denmark, a Dump folder for images with families from more than one country, France, Germany (which has Hesse and Prussia as subfolders as well), Great Britain, Greece, Italy, Luxembourg, OTMAA (I keep it separated from my Russian one since it's so big), Romania, Russia, Sweden, and finally, The Netherlands.
I have a lot of images!
I hope I explained it clearly. It's prolly confusing or cumbersome or whatever but it works for me.