Before I forget: Dr. Alzheimer, the one of the eponimous illness, was an Alois. And he was born in Marktbreit am Main which is indeed in Bavaria.
ISWYDT…
I tried looking up if “Zheimer” was a known surname so that someone could be named Al Zheimer, but apparently not. The etymology was originally Alzheim-er, someone from the Bavarian village of Alzheim.
From the Census files (I forget if it is 2010 or 2020 census):
OPPENHEIMER
HEIMER
MISENHEIMER
BERKHEIMER
WEINHEIMER
GUMMERSHEIMER
WERTHEIMER
DEXHEIMER
MEISENHEIMER
KELSHEIMER
GEGENHEIMER
THEIMER
DAHLHEIMER
SEILHEIMER
HEIMERDINGER
HERBOLSHEIMER
HOLZHEIMER
HOFHEIMER
BILLHEIMER
ALSHEIMER
SWICKHEIMER
SONTHEIMER
OSTHEIMER
LOVENSHEIMER
HERPOLSHEIMER
WINDSHEIMER
THALHEIMER
REINHEIMER
LEIPHEIMER
ELSHEIMER
BODENHEIMER
ALTHEIMER
WEIDENHEIMER
VEITENHEIMER
SONDHEIMER
ODENHEIMER
MELSHEIMER
MANNHEIMER
LAUBERSHEIMER
KOTHEIMER
HEIMERL
EPPERHEIMER
BECKELHEIMER
There is only one IE instead of EI:
HIEMER
Three of those caught my eyes immediately: Alsheimer, Altheimer, and Holzheimer
Is that close enough?
Personally, I like the Misenheimer. It sounds a lot like Wizenheimer.
As for male names starting with Al that are not last names:
ALBERT
ALAN
ALLEN
ALFRED
ALEXANDER
ALEX
ALVIN
ALLAN
ALFREDO
ALBERTO
ALEJANDRO
ALFONSO
ALTON
AL
ALONZO
ALI
ALVARO
ALEXIS
ALPHONSO
ALVA
ALPHONSE
ALDO
ALDEN
ALFONZO
ALEC
ALONSO
For what it’s worth, “Al” is the 435th most common male name in that census.
To make the lists above, the name had to appear at least 100 times in that census. Four local families in my community of about 35 people have last names that don’t appear on the census. In one of the families, I think that I have probably met everyone in the US with that last name. Searching on the Internet finds only one person with that last name who is not in the US.
At least three of the early settlers who didn’t remain had names not on the list.
Heim is cognate with the English Ham or Hamlet: a small village. So of course it appears frequently as part of a place name.
Um, if XI is legal, is Mu legal too?
Mu is a legal Scrabble word.
Honestly, who controls this? Is there an official Scrabble dictionary? It must be more voluminous and kept updated faster than any other dictionary. And this for every language in which the game is distributed.
Of course:
For every language you can play. Check the flag for German.
Without having clicked the link: Mind blown! My question was rather hypothetical, I’d never thought there were such dictionaries.
If I understand that right, there are professional Scrabble tournaments and players. Where there is money & egos involved there must be a referee and an undisputed autority to refer to. This seems to be it.
Ah, this is the level when a game stops being fun. I’d rather have a familial discussion about “Schwanzhund” 
Schwanzhund?
Wort nicht gefunden.
Official answer with a sad emoji.
I also stopped playing decades ago. But I would have loved to debate Schwanzhund with your family.
Yeah, the official rules for Scrabble just say that the players have to all agree on a dictionary. And for kitchen-table play, that works fine. But for a tournament, there has to be some dictionary that’s the one everyone agrees to by entering.
The game company doesn’t actually decide what makes it into the official Scrabble dictionary. Rather, they have a list of about eight standard dictionaries that they draw from, and it’s based on what those dictionaries accept (IIRC, it has to be in at least two of them, but it might just be one).
No it wasn’t my family 
, but Paul Winkelmann’s (Loriot) aunt Mechthild in “Ödipussi”.
Oh mein Gott! I am getting the impression that now, as I am getting old myself, I might finally find that film funny after all.
ETA to nitpick: That sketch is cheating, BTW. You only have seven letters to play with, so you can either play “NASE” or “SCHWANZ” on “HUND”, but not both. That is one letter too much.
My Scrabble dictionary is old, now. Is qat still legal?
And Nu and Pi
And also cognate to English home. The “Alz” is cognate to English all. So, Alzheim is equivalent to “all’s home”.
Sure nuff