Treebeard, welcome to Rootschat.
Kerry,
Dorcas. I had never heard the name before until I found a 9X great grandmother Dorcas Ann Mickelwright. I thought I'd name my next cat that.
And I too have know a Thirza. In my tree, I don't have a lot of odd names, but I do have a Marzolf, which was almost solely an Alsatian last name, except in my case, and it makes it easier tracing my ggg grandfather. And I have an Inez, which might be common in Spanish-speaking countries, but for a Jersey girl (and that's New Jersey

)in 1910, not so much. I have the odd Harriet, Viola, Miriam, Gertrude, Muriel, Gladys, Lavinia. And for boys, I've got Herbert, Norman, Maylin. And then my share of German, Alsatian, and Jewish names, common to those cultures but odd-sounding to me. You dont' see many Wilhelminias or Gustavs around here.
It would be interesting to see what names are common in England, but not so much in America (where I am) or Australia, Canada, etc. For example, my son is Liam, and he's the only one in our town. And I have a niece Maeve, which is very uncommon here, but probably not so in Ireland.
Kath