I have recently been browsing family records for the period 1909 to 1940 for the Tallin congregetion St Carolus (Kaarlikirik). I have seen the name Ratsep on the microfilms, also Raudsep. I will continue in a few weeks (I am looking for relative of my own) and if I see Ratsep in the lists I will make a note and let you know.