I knew someone would say that! I was almost going to say "and a tattoo saying "Mother" doesn't count"
I hope Doomscribe reads your post and can provide an answer. I miss that page too. I was going to create an Excel file or perhaps an Access table that I could convert into a Word document but it is a daunting task. I was going to use the index on Marvel Unlimited as a jumping off point but it is woefully underpopulated. The Doom entry on the Fandom wiki is a bit more complete I think.
At least it makes a good start. I like how it grades them as appearance ver sus minor appearance.
As for the source of how Stan and Jack decided on his ethnicity, I haven't found anything directly related to it. I have posted here before my thoughts about Kirby's time in the military being a possible source of inspiration and there's an excellent interview posted here on the Twomorrows.com site. It's quite long but once you get to the section about his WWII service, towards the end he talks about seeing a stockade of prisoners they were lead to by the local towns people. He doesn't mention where but I would think it would be France because he says he was in one of General Patton's divisions pushing their way through Europe as the Germans retreated. They had left these prisoners behind in the stockade and Kirby and his comrades in the scouting patrol released them. I would speculate that this is Kirby's first hand experience in how the Jewish where treated by the Germans and stuck with him all those years. My theory is that you rarely got a mention of ethnicity in those comics....probably Izzy Cohen in Sgt. Fury's commandos is the only character one could be sure was meant to be Jewish. Many films would have gypsy characters in them...there always seemed to be "gypsies" in the Universal monster movies of the 30s - 40s. There was the character of Maleva played by Russian actress Maria Ouspenskaya in the Lon Chaney Wolf Man movies .
There's always been disputes about how much of the FF stories were Stan Lee or Jack Kirby's. My hunch is that there is a lot of Kirby in the Doom origin. While doing more googling, I found this interesting piece that is authored by someone named Mark Hibbet and it appears to confirm our suspicions. In relating the part about Doom's family history where his father fails to cure the Baron's wife and has to flee from the Baron's wrath, he uses a Kirby quote here about his parents immigrated to the U.S. for this reason:Unfortunately he doesn't list a source for that quote but IMO it really confirms that Kirby had a lot of input in Doom's origin."This part of the origin may have its roots in Kurzberg family legend - Kirby claimed that "my father had insulted a member of the German aristocracy. My father knew he'd be killed, so he decided to emigrate."
I wish there had been some more interviews out there that discuss it but so far I've not found anything else. Stan frequently gave Kirby free rein when working with him but this is about all I can go by for now. I think it's pretty solid evidence so far.
Nice to see you back again!