I've got a last name with about 900 people on forebears, the problem with mine though is that there are three groups(maybe families? I'm not sure) who all prono

I've got a last name with about 900 people on forebears, the problem with mine though is that there are three groups(maybe families? I'm not sure) who all pronounce it differently(I happen to be in the least common basket). Correcting people on the pronounciation has been heavily ingrained in me but every once in a while I run into someone who is quite certain I'm saying my name incorrectly. Grar! Sidenote, how do you say slep?