Never heard of Sydney, but I HAVE heard of:
Stanley Ann Dunham
Mrs. Barack H. Obama
Anna Obama
Stanley Ann D. Obama
S. Ann Dunham
Ann Soetoro
S. Ann Dunham Sutoro
S. Ann Dunham Soetoro
... I’m sure I forgot a few ...
One version of the Kenya birth story is that the birth certificate refers to Obama senior by name, but Stanley Dunham by “Anna Toots.” The reason this is interesting is that the Dunham family used “Toots” as an informal proper noun for Obama juniors grandmother. Like mother like daughter?