Slepian rhymes with:
hovsepian, appian, campion, caspian, champion, ethiopian, fallopian, hagopian, homosapien, hovsepian, mississippian, olympian, rippeon, scorpion, stepien, thespian, utopian
Slepian sounds like:
salvina, salvino, schlobohm, sclafani, silvana, slaven, slavin, slavonia, sleven, slevin, slip-on, slovene, slovenia, slovenian, slovonia, sullivan, sylvain, sylvan, sylvana, sylvania