Surnames beginning with S
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- Seffort
- Seffras
- Seffray
- Seffrood
- Seffs
- Sefi
- Sefia
- Sefian
- Sefiani
- Sefidan
- Sefidchehreh
- Sefiloglu
- Sefitt
- Sefket
- Sefley
- Seflon
- Sefner
- Sefogah
- Sefolli
- Sefon
- Seford
- Sefout
- Sefranek
- Sefre
- Sefrich
- Sefrioui
- Sefriyan
- Sefroy
- Sefsouf
- Seft
- Sefta
- Seftali
- Seftan
- Seftel
- Sefteli
- Seften
- Seftick
- Seftin
- Seftince
- Seftlery
- Seftly
- Sefton
- Sefton Delmer
- Sefton-Green
- Sefton Green
- Sefton Jenkins
- Sefton Miles
- Sefton-Smith
- Sefton-Williams
- Sefton Wilson
- Seftor
- Sefty
- Sefu
- Sefuiva
- Sefu-Okula
- Sega
- Segaceanu
- Segache
- Segache Bougatef
- Segade
- Segade-Hermida
- Segadelli
- Segade Rodriguez
- Segado
- Sega-Fajecka
- Sega-Hall
- Segahutu
- Segain
- Segal
- Segala
- Segal-Cantor
- Segal Cantor
- Segale
- Segalen
- Segalen Steg
- Segales
- Segal Horn
- Segalini
- Segalis
- Segall
- Segalla
- Segalla Mensinga
- Segalla-Mesinga
- Segaller
- Segall Jones
- Segalman
- Segalov
- Segal-Sherry
- Segal-Vorobieva
- Segam
- Segameglio
- Segamon
- Segan
- Segantini
- Segar
- Segarajasinghe
- Segaram
- Segaran
- Segard
- Segarra
Surnames shown in bold text represent around 90% of the population of Great Britain. All other names are very uncommon in the UK and we are unlikely to have any useful data on them.