Hi Rainbow,
there were 34 Closs' living in Wales in 1861 - two of whom were Ellinor (no Elinor!). All of them were living in Llanberis, not Caernarfon, but not far away:
RG9/4340 Folio 7 Page 7
Llanberis Caernarvonshire
Ellinor Closs 1818 Aberdaron, Caernarvonshire, Wales Head
Elizabeth Closs 1858 Llanberis, Caernarvonshire, Wales Daughter
Jane Closs 1848 Llanberis, Caernarvonshire, Wales Daughter-in-law
John Closs 1843 Llandygai, Caernarvonshire, Wales Son-in-law
Robert Closs 1846 Llanberis, Caernarvonshire, Wales Son-in-law
Thomas Closs 1852 Llanberis, Caernarvonshire, Wales Son-in-law
William Closs 1850 Llanberis, Caernarvonshire, Wales Son-in-law
RG9/4340 Folio 5 Page 3
Llanberis Caernarvonshire
Robert Closs 1818 Llanberis, Caernarvonshire, Wales Head
Ellinor Closs 1822 Llanberis, Caernarvonshire, Wales Wife
If you want the images, let me know and I'll mail them on.
Here is also a list of other Closs, listed as head of household in 61:
David Closs 1823 Llanberis, CAE, Wales Head Llanberis CAE
Ellinor Closs 1818 Aberdaron, CAE, Wales Head Llanberis CAE
George Closs 1819 Tidenham, GLS, England Head Matherne CAE
Hephsibah Closs 1793 Llanberis, CAE, Wales Head Llanberis CAE
Robert Closs 1818 Llanberis, CAE, Wales Head Llanberis CAE
Thomas Closs 1826 Llanberis, CAE, Wales Head Llanberis CAE