 Their nobility was reaffirmed in Polish-Lithuanian Commonwealth and the Russian Empire.The family traces its roots to a 15th-century Ruthenian boyar Kalenik Mishkovich and derives from the name of his son, Tysha with the addition of the patronymic, resulting in Tyszkiewicz-Kalenicki.A branch of the family germanised the name to Tischkowitz and a few members of this branch are still to be found in Germany and the UK.