Jayne
Using the 1901 census decoder (freely available to everyone) their are only 25 Hillion's registered in 1901, a majority being registered in Jersey!
in family groups:-
St Ovens, Jersey
Joseph Hillion 29 farm lab french subject
Azeline " 26 "
Joseph " 1 St Ovens
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St John, Jersey
Marie Hillion 50 french subject
Jane " 47 "
Augusta " 13 "
Louis " 9 "
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St John, Jersey
Maria Hillion 17 St Johns, Jersey
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St Johns, Jersey
Jean Hillion 57 french subject
Mary " 54 "
Albert " 10 St Johns, Jersey
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St Ovens, Jersey
Jean Hillion 31 french subject
Eliza " 29 "
Jean " 5 St Ovens
Eliza " 3 "
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St Sampsons, Guernsey
John Hillion 22 St Peter, Guernsey
Edith " 1 St Sampson, "
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Trinity, Jersey
Julia Hillion 17 Longug, France
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Wanstead, Essex (next door to Ilford)
Edward Hillion 48 Bethnal Green, London
Mary Hillion 40 "
Mary Ann " 14 Woodford Green, Essex
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Blackpool, Lancs
Louisa Hillion 29 Warwick, Birmingham
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Islington, London, Middx
Lewis Hillion 20 Jersey
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North Wimbledon, Surrey
Marie Hillion 21 french subject
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Chirton, Northumberland
John Hillion 44 Preston, Lancs
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Regards
Bryant