Yes, people are guessing that the N showed up because of the phrase "Mine
Ed (
Ned)/ Mine
Abby (Nabby)" etc. in written letters, and then it just stuck.
'To Mine
Edward' or something along those lines.
Name These Characters 1 (over)
https://www.behindthename.com/bb/game/5316320
Name These Characters 2 (just started)
https://www.behindthename.com/bb/game/5327763
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https://www.behindthename.com/polls/member/181370