Jamera sounds made up and also sounds like it could/should be an Arabic/Islamic name, which might be odd if you have no connection to that culture. It reminds me of Jumeira Beach in Dubai.
Alithia also seems made up and sounds like Alicia said with a lisp, which could get tricky if you have to keep correcting people.
Henrietta's okay, don't love it, don't hate it.
Hilda is one old lady step too far for me, sorry. It's up there with Gertrude, Ada, Enid and Edna. Yuk.
If you like old lady chic I think Edith, Sybille, Dorothy, Daphne, Iris, Violet, Mary, Clementine and Evangeline are much nicer.
Tamsin is lovely. or Tabitha? Thea?