Transferred use of a surname, originally a Danish place name in Sønderjylland of uncertain meaning 
1) Old Danish tundær = 'tinder'
2) ?? thundern = 'enclosed beach'
|Female ♀||Male ♂|
|#: count of main first name only|
|&: count of both main and additional first names|
| Name counts are approximate as statistics normally is not published
for names given to less than 3 or 5 persons per country.
No recent statistics trend found in databases for Tønder.