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You can try going to Settings > General > Reset then tap "Reset Keyboard Dictionary". I think this wipes everything iOS has stored about your typing habits so it should hopefully fix the issue

I must have entered my wife's name in lower case at some point, because it autocompletes everyone else's names with a capital but leaves hers lower cased.

I wonder if you add a text expansion for "good night" expanding to "good night" again if it fixes it?

this is also a good trick for swear words! unsure if it will still be needed on 17 but fuck=fuck will stop iOS from autocorrecting it to duck