One of the challenges of family history research is variations in the spellings of names, among and between family sources or official records (and some searchable databases are very badly transcribed). I couldn’t find my mother’s mother’s birth record, then thought to search for the equivalent of McArthur rather than Macarthur. Similarly, I was also able to find her grandparents’ marriage record in a province of Canada (her grandfather was serving in the British army at the time, and her father was born in Bermuda).
For given names, there are Catherine/Katherine, Alexandr(i)a and Ann(i)(e)/Anna, Mary Ann(e)/Anna, Mary-Ann(e) and Marianne. One relative I didn’t know the existence of until very recently (a great-grandfather’s sister) is rendered as Matilda M A on her birth record, Matilda M on her marriage record and the birth records for three children, Matilda Marrianna on her death record and the Find a grave website, Matilda Mary A on one son’s death record and Marianne Matilda on the other’s. The name Marrianna exists, but is far less common than all those other variations.
I found her and three more siblings because my father’s family history notes refer to ‘the rest of the family’ (that is, not my great-grandfather or the brother we knew about, mainly because those two married sisters). My father had a lot of information about his mother’s mother’s side and a medium amount about his father’s father’s side. This family is his mother’s father’s side, and I’ve found his older sibling who died young, three younger siblings and 13 nieces and nephews. Any more research is limited by publicly searchable records being restricted to more than 100 years for births, 50 or 60 years for marriages and 30 years for deaths. I also had basically nothing about his father’s mother’s side, but was able to connect a few dots and find an extensive listing of her relatives in England and Canada. The compiler of that website didn’t know that she had come to Australia. There’s an intriguing story about her, which I’m still waiting for a reply from a historical organisation about, so won’t tell you now.
[PS 19 Sep: My searches of the Births, Deaths and Marriages records in Victoria and New South Wales failed to find a small number of distant relatives who I know exist(ed). I’ve started over on those ones, trying every combination of spelling that I can, and have found most of the missing ones. It is not uncommon for someone’s name to be spelled different on their birth, marriage and death record (which might be a transcription error).