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As some viewers may not know - "Dipper" is not Dipper Pines true first name. It's a nickname that was either given to him or he assumed because of an embarrassing birthmark on his forehead shaped like the big dipper constellation.
It's my theory that - if Grunkle Stanford does have a twin brother named "Stanley", that they may have passed the name down through the linage. Which would make Dipper Pines' father, Stanley Pines Junior, and Dipper - Stanley Pines III.
But what do you think? Leave your theories and suggestions in the comments below!
DIPPER'S SECRET FIRST NAME (GRAVITY FALLS): The Royal Order of the Holy Mackerel