The German Name Thelen
This name occurs in the Rhineland and Westphalia. I know it means son of Thele so did the name evolve from that or something else and when.
Tags:  German
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THELEN: Dutch and North German: patronymic from a pet form of the personal name Thietilo, of Germanic origin, derived from a short form of Theodoric (see Terry 1). TERRY: English and Irish: from the common Norman personal name, T(h)erry (Old French Thierri), composed of the unattested Germanic element þeudo- ‘people’, ‘race’ + rīc ‘power’. Theodoric was the name of the Ostrogothic leader (c. 454–526) who invaded Italy in 488 and established his capital at Ravenna in 493. His name was often taken as a derivative of Greek Theodōros (see Theodore).
(Dictionary of American Family Names, Oxford University Press)
www.ancestry.comMy German dictionary of surnames (Duden, Familiennamen) has:
THELEN: Familiy name going back to a form of Thielen
THIELEN: Patronym of Thiel(e)
THIEL(E): From Thia(di)lo, Thilo, petform of namen containing the element "thiad/diot*" (usually Dietrich)
* people
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