If directed here from the Nordic Noble Surname Project the name Pereswetoff-Morath refers to the following.
Colonel Alexander Pereswetoff-Morath was naturalized to the Swedish nobility in 1652 under n:o 559.
The name Pereswetoff-Morath is one of the most famous names in the history of Swedish bayors or boyars as in Swedish referring to Russian noblemen in general, and particularly a group of Russian noble families who had entered Swedish service in the late sixteenth–early seventeenth centuries and were incorporated into the Swedish nobility.
In Russian form the name Peresvetov reads as Пересветов.