Eliza is a beautiful name and I'm so sorry to read that your Eliza died earlier this year.
Matilda and Annie are also fabulous names, I think Annie goes particularly well with Eliza as they both start with a vowel but have different ending sounds. Other names I think go well with Eliza include Nancy, Miriam, Mary, Mabel, Martha, Flora, Florence, Constance (Connie), Hannah, Sally, Susan, Maggie, Betty, Bethany, Madeleine, Agnes, Margot, Lucy, Felicity, Imogen, Harriet, Alice and Phoebe.
For boys; Thomas, Benjamin, Edward, William, Jonah, Toby, Daniel, James, Seth, Reuben, Isaac, Charlie, Henry, Harry, George, Gabriel, Frederick, Jude and Jesse.