As I do every day around 5:30, I was thinking about "Darkwing Duck." On the show, Darkwing's meek alterego, Drake Mallard, lives next to an annoying family. The father is Herb Muddlefoot. The wife is Beaky Muddlefoot. The two sons, if I remember correctly, are Tank and Honker Muddlefoot. Now, judging from the enthusiastic response my last grammar-related post drew, I feel I can benefit from much feedback to this question:
When speaking about Drake Mallard's neighbors as a group, should I call them the Muddlefoots or the Muddlefeet?
I mean, the plural of "foot" is "feet," but should this rule extend to proper names? Input, please, you grammaticians and associated pickers of nits.