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"Bjorns mottar haelgond sygar!", which closely resembles the Icelandic phrase, "Bjorns móðir, Haelgond, sýgur!", which means: "Bjorn's mother, Haelgond, sucks!"
"Mottar" = "Mother"
"Dottar" = "Daughter"
It is possible that the Common language originated from or is a dialect of the Vrykul language, as many words are similar. However it should be noted that Common shares many of the same words from Gnome and Dwarven languages as well which would imply a possible connection to the Titan (language).
Bjorn, Ingvar, and most other Vrykul names are actually Scandinavian and Icelandic names, and their language also looks a lot like Icelandic, which can be partly understood by Icelandic players.