I reviewed the surname index in the recently published Jacobi Papers (2019) and found these references: 1) mi-Tikocyn [meaning 'of Tikocyn', used in place of a surname] (Heschel, Vol. 2), 2) Ticktiner (Horowitz. Vol. 2), and 3) Tykoczinsky (Prager, Vol. 3). The surnames in parentheses are the names of the chapters and volume numbers in which the Tykocin related surnames can be found (in relation to the main family being studied in the chapter). At the beginning of each chapter is a list of surnames in that chapter, and that is where the specific entry number within the chapter can be found (this is a two step process to locate the exact entry in which the surname appears). I do not have the Papers or I would look these up myself. The Papers can be obtained either here https://avotaynu.com/books/Jacobi-Papers.html, or at a local library (see Worldcat for library availability).
