Surnames beginning with I
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- Irrinki
- Irrvin
- Irsay
- Irshad
- Irshaid
- Irskine
- Irsland
- Irson
- Irtaza
- Irtelli
- Irtiza
- Irton
- Irudayaraj
- Irukulla
- Irukwu
- Irum
- Irumba
- Irumba-Williams
- Irune
- Irungu
- Iruo
- Iruobe
- Iruoha
- Irupey
- Irurita
- Irusta
- Iruthayam
- Iruthayanathan
- Irvan
- Irvani
- Irvanipour
- Irven
- Irverx
- Irves
- Irvie
- Irvimg
- Irvin
- Irvine
- Irvine-Brown
- Irvine-Capel
- Irvine-Fortescue
- Irvine-Fynn
- Irvine Robertson
- Irvine-Smith
- Irving
- Irving Andrews
- Irving-Bell
- Irving Brown
- Irving-Lewis
- Irving-Phillips
- Irvings
- Irving-Smith
- Irving-Swift
- Irvington
- Irvins
- Irvin-Wright
- Irwan
- Irwell
- Irwen
- Irwig
- Irwin
- Irwin-Bowler
- Irwin-Brown
- Irwin-Childs
- Irwin-Clark
- Irwin Crookes
- Irwine
- Irwing
- Irwin-Houston
- Irwins
- Irwin-Sawdon
- Irwin-Singer
- Irwin-Smith
- Iryland
- Iryna
- Irytowski
- Irzyk
- Irzynski
- Is
- Isa
- Isaac
- Isaace
- Isaaces
- Isaac-Henry
- Isaachs
- Isaack
- Isaacks
- Isaacs
- Isaac-Saul
- Isaacson
- Isaacs-Sodeye
- Isaak
- Isaaks
- Isaal
- Isaaman
- Isaaq
- Isabel
- Isabele
- Isabell
- Isabella
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.