This is a great conversation, thank you!
It is very common on my mother's English side, for the family to reuse names when one child dies, the next of the same gender gets the recycled name. Seems weird by our standards today, but very common, even in the U.S. not that long ago.
I haven't had the issue of abrupt merges on this case, though I have in others, so I could easily see this happening.
I like the Died Young sticker and didn't know it existed, so thank you for sharing that!
For unnamed infants, I use the standard convention of "Unknown" rather than "Infant." I believe "Infant" will result in a Suggestion (a.k.a db error) to fix it.