name = Name has been used once, in the clan which the column is referencing. This name can still be used by other clans, but cannot be used again in the same clan.
Names marked with * are an exemption to the above rule as they were created before this rule was implemented.
name = this name is in several columns/in use by two cats and therefore CANNOT be used again until once such cat dies. An exception is with the "Three's a crowd" rule.
name = this name is in several columns/in use by three cats and CANNOT be used again until one such cat dies.