Surname Illsley (Illsley 
) , all around the world, is quite a rare cognomen. The surname Illsley is characteristic of the United Kingdom, where it is quite a rare surname, New Zealand, where it is a rare surname, and Canada. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Canada.
| VARIANT | COUNTRY |
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| Illsley | Canada, United Kingdom, United States, New Zealand, Australia |
| david wallace illsley American politician – Minnesota -- "D.W., Dave" Senate 1923-26 (District 18), US (b. 1864) |
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| percival j. illsley Canadian composer, CA (b. 1865) |
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| ralph h. illsley American politician – Minnesota -House 1945-52 (District 18), US (b. 1896) |
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john illsley English musician, GB (b. 1949) |
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| leslie illsley English artist and sculptor, GB (b. 1936) |
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| bryan illsley (b. 1937) |
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| eric illsley British politician (born 1955), GB (b. 1955) |
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| mark illsley film director, US (b. 1958) |
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| nicholas p illsley researcher ORCID ID = 0000-0002-4336-2832 |
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| matthew illsley researcher |
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| hugh percival illsley architect |
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| charlotte sara illsley researcher (ORCID 0000-0001-9429-633X) |
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| john sherwood illsley |
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| bryan illsley |
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