I don't know if there is a connection. The information I have states that Johann Christain Lebrecht Grabau was born 1 July 1810, in Leipzig, Germany. His son, Johann Frederick married Charolette Kuhlo from Prussia. I believe Johann Frederick migrated to the US as his son John Gottlieb was born in Tower Hill, IL. I have no idea how they got to the US or when they crossed. I will keep your note for reference incase I learn anything more.