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).Swedish: from
an unexplained first element (see Thelander) + the common
ornamental suffix -en.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
44,647
Historical Documents & Family Trees with Thelen
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