In the Witcher novels, Zoltan gives Geralt a named sword, Sihil. A similar named sword, G'valchir, is earned as a reward for a quest in the computer game. This sword is described as being a Mahakaman rune sihil, not necessarily the Sihil from the novels.
Upon using it against bandits, Geralt noted that the blade barely felt any resistance as it cut through its targets.
The Dwarven runes forged on it, "na pohybel skurwysynom", is loosely translated into a combination of "May they perish/To their doom" and "whoresons" or more colloquially; "Death to the motherfuckers".