Love Jessica and Hannah. I have a Jessica and Hannah was on my shortlist twice.
Harriet and Flora both nice enough, I have no strong feelings about them.
Love William and quite like Sebastian.
Really dislike Seth and Wilfred. I know they're both well sued for children nowadays but they're still old men to me.
You seem to have quite classic taste. How about:
Abigail, Amy, Alice, Bryony, Bethany, Charlotte, Chloe, Daisy, Emma, Emily, Eleanor, Elizabeth, Frances, Georgia, Georgina, Grace, Isabel, Joanna, Juliet, Katherine, Katie, Lucy, Laura, Lara, Melissa, Madeleine, Miriam, Naomi, Natalie, Natasha, Olivia, Phoebe, Rebecca, Rachel, Rose, Sarah, Sophie, Sophia, Victoria, Zoe
Adam, Benjamin, Christopher, Daniel, David, Elliot, Edward, Ethan, Frederick, George, Henry, Isaac, Joseph, John, James, Jonathan, Jacob, Luke, Matthew, Nicholas, Oliver, Patrick, Peter, Robert, Sidney, Solomon, Thomas, Timothy, Vincent, Zachary