טונקל
'dark'
ETYMOLOGY
cf. Silesian German tuŋkl, Old Silesian German tunkel
ON døkkr, OS dunkar, OHG tunkal, MHG tunkel, dunkel, ENHG tunkel, dunkel, NHG dunkel; from PGmc ✱dunkla- ~ ✱dunkra- 'dark'; from PIE ✱dʰngʷ-lo-.
Kluge/Seebold suggests the PIE root ✱dʰem- 'to whisk, smoke' with a nasal extension ✱dʰengu-, ✱dʰenguo-, and with a Germanic suffix -l.
The initial t- dominated in MHG and until 1500, when it was supplanted by d-, and completely displaced by the 18th c.

{Yiddish Language Atlas of the Soviet Union 1931, map 15}

WESTERN
tunkəl {Schnitzler, Prager Judendeutsch, 20}
Oyberland (West Transcarpathian)
düŋkl̥ {WTCP, Budapest, Hutterer 1965: 137}
tyŋklʲ 'type of grain' {WTCP, Dunajská Streda, 47179}
tynkl̩ʲ {WTCP, Vác, 47197}
tɩŋklʲ {חסידים} {WTCP, Berettyó-Újfalu, 47212}
- tyŋklʲ blɔ˯u טונקל בלוי
CENTRAL
Unterland (East Transcarpathian)
tiŋklʲ, tɩŋklʲ {ETCP, Sîg Felső Szek, 47223}
ba naxt ɩs tɩŋklʲ בײַ נאַכט איז טונקל {ETCP, Nyzhnya Apsha, 48233}
tɩŋklʲ blu טונקל בלאָ {POLAND, Wolbrom, 50196}
- ɩn tɩŋkʎən cɩ́mɛ אין טונקעלן צימער
fatɩnkʎən dəm tɩnkəʎn vɩnkʎ פֿאַרטונקלען דעם טינקעלן ווינקל {POLAND, Warsaw, 52211}
NORTHEASTERN
Lithuania
tuŋkɫ {LITHUANIA, Vilnius, 54257}
SOUTHEASTERN
tɩŋʲkʎ vɩŋʲkʎ טונקל ווינקל {ROMANIA, Brăila, 45273}
- tɩŋkʎəm vɩŋkʎ טונקלעם ווינקל