Here's the exact reference for info on the name Ratzlaff:
The Mennonite Encyclopedia, V.IV (A comprehensive workon the Anabaptist-Mennonite Movement). Mennonite Publishing House, Scottdale, Pennsylvania. (I did not note the pub.date, but noted this info in 1971 or 1972) P. 255 RATZLAFF (Raatslaf, Retzlaff), a family name found among the mennonites of West Prussian and Danzig background in Russia and North and South America.The name appear particularly among the Flemish Mennonites of Kleinsee (Jeziorka, q.v.), Przechovka-Konopath, and Kazun, and is supposed to have been derived from the Slavic name Ratislav.The Przechovka-Konopath congregation had the following ministers:Berent Ratzlaff (c.1660), Peter Ratzlaff (1689-1775), Hans Ratzlaff (1727-88),Heinrich Ratzlaff (1742-1805), and Jacob Ratzlaff (1765 - ?).At Kleinsee-Jeziorka, Peter Ratzlaff (b.1742) became Elder and Berent Ratzlaff, Minister, both in 1785.When the Przechovka Mennonite Church moved to Russia it was known as the Alexanderwohl Church (q.v.).The Ratzlaffs spread in Russia, many of them later coming to America, particularly to Kansas.Abraham Ratzlaff (d.1939) was a minister at Buhler and Abraham K. Ratzlaff is a physician in Goessel, Kansas.Mary Ratzlaff has charge of the Salem Home for the Aged at Hillsboro, Kansas.
(and on pp.1999-120, from the article on Poland)
There is some evidence that intermarriages have taken place between the Mennonites and the Poles since the early days of thier settlement (of the Mennonites' settelement in Poland around 1535).In some instance, since it was forbidden to proselyte among non-mennonites, Polish nationals went to Holland to become members of the Mennonite Church, and, after their return, married a Mennonite and transferred their membership to the local church.Some of the names which are still common among Mennonites which are likely of Polish origin are Delesky, Ratzlaff, Rogalsky, Sawatzky, Schepanski, Tetzlaff, Tilitsky and Utesch.Quiring (107) lists fifty words in the low German language which are of Polish background.These are adaptations made by Mennonites while living in a Polish environment.