The Dutch / German thing does appear to be valid..
Today, the Savelkoul families still range throught Germany and Holland.
After YEARS or research etc... SAVACOOL was the orininal and correct spelling. people's accent changes the spelling. I even pronounced it as Savercool when I was young,.It is equal to WATER or WORTER..WARTER.... Anyway, ask a Savelkoul to pronounce their Sur name...You will be most interested when you hear SAV*A*COOL. BTW there are a few SAVELKOUL fams in the usa.
NO QUESTION the human brain dreams and creates many fancy stores...Savacool, is no more French then Hitler was.