Transferred use of the surname
2) From an Old English place name: Old English sīdan = 'wide' and ēg = 'island in a river, riverside meadow' 
See also Sid
|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 Sidney.