If you had read the description of Dwarves as they occur in Illarion, found at
http://www.moonsilver.de/english/races/dwarfs.htm then you would have seen the true information relating to dwarven surnames as it applies to those in the world of Illarion. Here is the applicable quotation as found in the description of dwarves mentioned above:
"Every dwarven clan consists of several families. A typical dwarven family consists of a man, his wife, and the children. A common number of children is two to four. When getting married, a new family is founded and they choose a new family name. This is the reason why dwarves tell their names by "Son of... and ... Son of... etc.", female dwarfs name their mothers and grandmothers. The actual, self-chosen family name is not mentioned and never told to strangers. This is done to prevent curses against the family."
Hopefully this will help those who play dwarven characters. Their history according to the creators of the game, and thus the world of Illarion, makes no mention of providing a falsified surname, as Paul Laffing offered, but does describe how dwarves referred to one another with their family lineage included, yet without the mention of the surname.