There is a reason to believe that the following names, or a few of them are quite related, e.g.
Türkelova and Turklova (names of a Turkel's spouse); Turkelewitz;
Turkeltaub, Tirkeltaub, Terkeltaub, Tarkeltaub, (Jewish derivatives) Turkeltoiv and Tirkeltoiv; Turkler, Tirken, Tirkner, Tirko,
(Slavic: Slovenic / Croatic notations) Trkal, Turkelj, Turkalj (etc.),
(Russian accent G) Turgal, Turgel, Turgl,
(Romanian accent S/C) Turshel, Turchel, Turckel, etc.