Thanks for the reply.
I am currently unable to check MLS data, but will do so this evening.
On the user side, it was reported as incorrect on an iOS device. I have confirmed that it shows incorrectly on both iOS and Android in LDS Tools, both with a new install and after a sync.
on lds.org, if I look at the membership records, there is no mention of the household name that shows up in LDS Tools, both in the individual and household tabs. If I edit the individual, the "Family Name" and "Individual name(s)" fields are correct, mirrored by the preferred names, with the suffix blank.
Note that the incorrect name is the name of another household at the same address (the incorrect one is a basement apartment). This appears to be the only connection between them, though it's possible that they were all listed as the same household in the past, due to the address. They are not directly related, no close family ties, so I don't think that should be the case, but I can't verify it -- it all looks correct.
Seems like a bug of some sort to me, but I was hoping that was not the case. Thanks again for any help.