Because his parents gave him that name...dumbsht
Teddy's father's name is Theodore. Teddy's mother's name is Martha.
Theodor Larzon's birth name is Alve Theodor Larzon.
Theodor Storm's birth name is Hans Theodor Woldsen Storm.
Theodor Grieg's birth name is Theodor Maria Ignaz Grieg.
Vlad Theodor Cacinschi's birth name is Vlad-Theodor Cacinschi.
Theodor Christensen's birth name is Chistensen, Christian Johannes Theodor Gleerup.
Theodor Seuss Geisel is "Dr. Seuss" real name.
Theodor Morell's birth name is Theodor Gilbert Morell.
Theodor Berthels's birth name is Bertil Teodor Jonsson.
Theodor Loos's birth name is August Konrad Loos.
Ludwig Herzer's birth name is Ludwig Herzl.