That's why I posted it. I thought it would help.
Yes there are registrations, but in a case like yours there may not have been a registered marriage. There could have been a church marriage, or nothing.
It is more likely that the children's births would have been registered, and this may give the mother's name
Go to
www.familysearch.org, ; library, catalog, fiji, civil registrations, and look for the films that would cover the right period. The first births film might be the right one. Take its number
Then go to your nearest Mormon Family History Centre and order that film.
When it comes, the births are listed in alphabetical family order, under the father, and all the children are listed in a group.
Read the whole film, as there are odd things at the end.
There is also a Royalty website which has the Fijian lines, and you may find her mentioned under the Cakobaus. I can't remember its name, but Google
Royalty- Fiji- Cakobau
Christine