I've seen references to Leat 7rice people, but never the thing itself.
Lucky you!
Where I live,
Elma would be a contracted form of
Elizabeth Maria and wouldn't attract attention. "White" Afrikaans-speaking South Africans traditionally had a very small name pool and, often, very large families with strong traditions about naming the first son after the paternal grandfather etc, etc so that family trees were very repetitive and so were family gatherings. So an
Elma here could well have a cousin
Bettie and another cousin
Marielle, but they'd all be
Elizabeth Maria and named after granny. (On the other hand, "coloured" Afrikaans-speaking South Africans might well have heard
Alma as
Elma and used a spelling pronunciation. It's a dialectal thing. Sorry to have to use these ghastly terms, straight back to the bad old days, but they do explain things sometimes.)
Marymargaret looks very Catholic. Two saints sharing the same day, perhaps.
I'd have thought that
Sally is a bit of a stretch from
Rosella. Interesting.