In the past, spelling of names wasn't fixed, and could vary with local dialect, changing pronunciation, or personal preference.
Thus names like Beernink, Beerning, and Berning may all be variants of the same name. However, until a common ancestor is found it's hard to tell whether people with these names
are all descended from the same family, or whether they arose separately.
For example, there was a Beernink family that owned a piece of property in Wierden, near Almelo, from about 1350 to about 1550.
In the records of the transfers
of this single piece of property from one generation to the next you see the following spellings (from oldest to most recent):
Berendinch, Berndinc, Beerning, Bernynge, Bernyng, Beerninck, and Berninck.
Spelling of Dutch family names became fixed in 1811, when Napoleon decreed
family names for everyone. Fortunately, most
of the variants were no longer in use when family names became fixed: Today, Beernink is the most common spelling, with Beerning and Berning also in use.