Koistinen Family History
Koistinen Surname Meaning
Finnish: from the personal name Koisti the Finnish form of Konstantin (see Constantine) + the surname suffix -nen.
Recorded since the 16th century in Savonia in the east of Finland from where it spread to North Karelia, Kainuu, Ostrobothnia, and somewhat to the Karelian Isthmus.
Source: Dictionary of American Family Names 2nd edition, 2022
