If this is wrong name it could be from Google Maps.
It is named Sovink at Najdi.si (https://zemljevid.najdi.si/poi/POI27183/slap-sovink), https://www.td-kanal.si/vredno-ogleda/2016043008035944/SLAP-SOVINK/.

Named Savinka on other sites:
https://www.visitkanal.si/sl/dediscina/naravna-dediscina/slap-savinka/;
https://izleti.turisticna-zveza.si/seznam/4227;
https://mojajezera.si/seznam_mojih_slapov/934/slap_savinka/