I have had a good look for your ancestors with the resources available to me, in 1881 your ancestor is the only entry for mottoul in the whole of the UK:
Dwelling: Neath Road
Census Place: Clase, Glamorgan, Wales
Source: FHL Film 1342290 PRO Ref RG11 Piece 5353 Folio 56 Page 70
Marr Age Sex Birthplace
Alex AELZER M 35 M Maestrict, The Netherlands
Rel: Head
Occ: Spelterman
Josephine AELZER M 45 F Huy, Belgium
Rel: Wife
Robert AELZER 13 M Swansea, Glamorgan, Wales
Rel: Son
Occ: Tending Masons
Josephine AELZER 11 F Swansea, Glamorgan, Wales
Rel: Dau
Occ: Scholar
Cristiana AELZER 11 F Swansea, Glamorgan, Wales
Rel: Dau
Occ: Scholar
Louis MOTTOUL 26 M Grasen, Belgium
Rel: Lodger
Occ: Spelterman
Richard VERBABE 22 M Corsel, Belgium
Rel: Lodger
Occ: Spelterman
The problem with the 1901 census is that the name has not got a phonetic / soundex search facility. So you have to put the exact name in, and of course if you don't know
how the surname was enumerated you have a possibility of not finding your ancestors, just for your information I have tried the following variations in the 1901 search:
Mottoll, Mottoul, Mottole, Mottall, Mottal(x4), Mottaul, Motoll, Motoul, Mottoulle, Motole, Motall, Motal, Motaul, Modal, Modaul, Modall (x3), Motool, Modool, Motul, Mottul, Modul, Modole, Module, Motter (x21), Mottern.
Can anyone else think of any others possibles that the name might have been enumerated under?
1901 The only entry for Mottoul:
Name Age Where Born Administrative County Civil Parish Occupation
Lettice Mottoul 14 Glam Swansea Glamorgan Llandyfodwg Dress Maker
Aaron Mottal 28 Poland London Spitalfields Tailors Machinist
Annie Mottal 28 Poland London Spitalfields
Mary Mottal 2 London Spitalfields London Spitalfields
Morris Mottal 5 London Spitalfields London Spitalfields
Watson Mottal 24 Glasgow Lancashire Warwick Nuneaton Comedian Act
You could try subscribing to a mailing list, you will find a list of excellent lists here:
http://www.rootsweb.com/~jfuller/gen_mail.html the Belgian lists you will find via:
http://www.rootsweb.com/~jfuller/gen_mail_country-blg.htmlThere are a list of Mottoul's (and in Belgium) on the LDS site:
http://www.familysearch.org/Eng/Search/frameset_search.aspHowever no Louis (apart from the 1881 census given above) and no other Mottoul's born in Grasen.
The Free BMD:
http://freebmd.rootsweb.com/cgi/search.pl has these results:
Surname First name(s) Age District Vol Page
Marriages Jun 1885
MOTTOUL Louis Swansea 11a 1014
Births Mar 1887
Mottoul Lettice Annie Swansea 11a 735
Births Dec 1891
Mottoul Thomas Stafford Swansea 11a 905
Deaths Mar 1892
Mottoul Rosaline 3 Swansea 11a 531
Deaths Jun 1893
Mottoul Thomas Stafford 1 Swansea 11a 525
I have also noted whilst searching that the name appears in general as Mottoule (not without the 'e')
Sorry I haven't been able to come up with anything concrete for you, I wish you all the very best in your research.