Research has revealed a rich history of Rombs people on both sides of the Rhein River within about 30 km of Karlsruhe from about 1800 backward until just after the Thirty Years War. Interestingly, the Rombs families during this period seem to have made it their specialty to teach at village schools in small, largely Catholic villages. A common connection to all of the villages is the Bishopric of Speyer, which had some supervisory authority.
Earliest records are from Jockgrim, Neibsheim, Buchig, Bauerbach, Oberwisheim, Zeutern, Bruchsal, Oberlauterbach, and Kesseldorf. The earliest records point to Franconian origins. The geographical area covered is represented below. See https://goo.gl/maps/WzC4dAaFDb72Qg6g8 .
If you would like to learn more about the 17th and 18th century history of Rombs ancestors and teaching, use this link. It contains some fascinatingly detailed information from current day Alsace and Baden and the Rhein Palatinate. An example is the following record of the marriage between (the teacher) Johannes Rombs and Barbara Schickel in 1744 in Oberlauterbach. (These are my 5th great-grandparents.) There is even some detailed information about the life of my 6th great-grandfather Johann Michael Rombs.