Good evening! Yes, Jochim's came from Rülzheim (today Germany). They went to Russia in the 18th century. I am Barbara Jochim's granddaughter. My grandma's parents were Simeon and Scholastika Jochim (born Schardt). They were living in Katherinental, Cherson, Ukraine (near the lake Beresan).
Their ancestry were from Rülzheim. You can find out more information, birth cert. and other documents in Bistum-Speyer (church records etc.).