Tombstone: isnt that the one i stole the muffons from when i was drunk in lospegasus?...... okay the time i was drunk their with discord

yes. yes it is

Better keep her away from Ditzy Doo .

first of all, her name is Derpy. and Muffin Cup is a descendant of said clumsy pegasus

The first point is arguable. The second point makes sense though.

her name was originally derpy. all merchandise uses the name derpy. there is no canon use of the name ditzy doo.

Winter Wrap Up: "Ditzy Doo accidently went north to fetch the southern birds"
As far as I know, there is no use of the name Derpy on the show either.
I don't know why it bothers you so much. My original comment was only trying to be silly, not invoke an argument.

sorry, i wasn't trying to come across as upset. my friends and i just prefer the name derpy. her name was originally derpy, and if you watch the original version of "the last roundup" she is callled that. it was edited after controversy over derpy being "retarded" arose.

Ah yes, forced editting for the lose. I looked it up on the wiki and it would appear that you are correct. They adopted Derpy as her official name. Note the following paragraph though:

The character is called "Derpy" on-screen in The Last Roundup, detailed below. The episode's writer noted that the character's name in the script was originally Ditzy Doo, and she was requested to change the name to Derpy as a "tip of the hat" to the fans. Lauren Faust notes in her Bronies Documentary interview that she imagined Derpy as a "Harpo Marx kind of character who didn't speak and who no one really called out by name", leaving her mysterious and "a blank slate for the fans.

Anyway, no hard feelings then.

never were. just a misunderstanding. love and tolerate, you know?