Names that support or incite the violation of the Tibia Rules:
Of course, all names that support rule violations ("Friend of Insults", "Hackers Rox") or incite a violation of the Tibia Rules ("Spam Sponsor") are illegal in Tibia and might also lead to further punishments.
Names that announce or imply the violation of the Tibia Rules:
Names that clearly announce the breaking of a Tibia Rule ("Sellacc", "Harry Botter") will not only be namelocked, but might also receive a further punishment. The same applies to names which obviously fake an official position ("Admin on Antica", "Baetleye Premia", "God Durin").
A name will be considered to imply a rule violation simply by naming it ("Bothater", "Spammkiller").