He was born in Tapiau, which once was half Lithuanian.
In Kurschat's dictionary there is:
KO~RINETI/KO~RINTI = elend und krank sich nur mit Mühe fortschleppen (drag oneself along sick and with pain)
KORINETI = Honig sammeln (collect honey)
Both meanings would make sense: honey-collector or cripple.
It is more possible that surname comes from such Lithuanian name as Kargaudas, Kaributas, Karigailas, Karijotas, ... Short forms of these names are Kargas, Karibas, Karigas, Karijus,... It can be that there were names Karkantas and Karkintas too, the last of them in some way was shortened into Karintas or Korintas. There is Greek surname Karkantas.