French: from the Latin personal name Ionis, which also
occurs as an element of place names. The personal name was popularized
by a 3rd-century Athenian saint who evangelized Châtres
(present-day Arpajon), where he was martyred. As an American family
name, it is probably of Huguenot origin.
Korean (Yon): there are three Chinese characters for the
surname Yon, only one of which occurs frequently enough to
be treated here. Some sources indicate that there are thirty Yon
clans, but they all seem to be descended from the Hapsan Yon clan,
whose founding ancestor, Yon Su–ch’ang, migrated to the Koryo
kingdom after escorting a princess to the Koryo court. The king
(probably King Ch’ungyol (1274–1308)) gave him some land in the
Hapsan area, and so began the Hapsan Yon clan. The surname can be
found throughout the peninsula, but it is most common in
Ch’ungch’ong North province.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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