Surnames beginning with S
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- Siwa
- Siwach
- Siwadi
- Siwak
- Siwakowski
- Siwal
- Siwale
- Siwani
- Siwawa
- Siwczak
- Siwecka
- Siwecki
- Siwek
- Siwela
- Siwell
- Siwiak
- Siwicka
- Siwicki
- Siwiec
- Siwik
- Siwinska
- Siwinski
- Siwira
- Siwisa
- Siwji
- Siwka
- Siwko
- Siwo
- Siwoku
- Siwon
- Siwonia
- Siwoniku
- Siwula
- Siwy
- Six
- Sixmith
- Sixon
- Sixsmith
- Sixt
- Sixto
- Sixton
- Siy
- Siya
- Siyaad
- Siyab
- Siyad
- Siyambalapitiya
- Siyanbola
- Siyani
- Siyapi
- Siyawamwaya
- Siyawareva
- Siyer
- Siyirtmac
- Siyodia
- Siyolwe
- Siyum
- Siza
- Sizar
- Size
- Sizeland
- Sizemore
- Sizen
- Sizer
- Sizerland
- Siziba
- Sizinceva
- Sizman
- Sizmore
- Sizmur
- Sizoongo
- Sizor
- Sizov
- Sizova
- Sizovs
- Sizzey
- S'Jacob
- Sjad
- Sjamsul
- Sjenitzer
- Sjobeck
- Sjoberg
- Sjöblom
- Sjoborg
- Sjodahl
- Sjodin
- Sjoedin
- Sjoerdsma
- Sjogren
- Sjoholm
- Sjolander
- Sjolin
- Sjollema
- Sjolund
- Sjoman
- Sjomin
- Sjoo
- Sjoquist
- Sjostedt
- Sjostrand
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.