Because Tonks hated to be called Nymphadora at the funeral, and whenever mentioning her she was always referred to as Tonks, because that's who she was, that was her name, they'd never soil her memory by calling her someone she wasn't.
Headcanon:
When Fred gets to the afterlife and meets James Potter he's gonna be like 'that little sh*t (Harry) never told me his dad was a Marauder-'
Headcanon:
Teddy's patronus is a werewolf. Enough said.
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