Herb's name

If Herb is supposed to have an icelandic last name it is actually misspelled. When Snæfellsjökull is used in the traditional way that icelanders use lastnames, thereby Snæfellsjökull is supposed to be his father, which is impossible since it is not a real human name, it should be Snæfellsjökulsson not Snæfellsjökul(l)sson. I don't know if that's the case, but if so I feel it's a huge error in this film.