Emilys I know have siblings called:
Oliver, Henry, George, Ben, Simon
Olivia, Jemima, Jessica, Harriet, Georgina
I also think Emily goes well with:
Aiden, Alexander, Dominic, Elliot, Harvey, Isaac, Joshua, Jack, Lucas, Matthew, Nathaniel, Nicholas, Owen, Oscar, Patrick, Reuben, Thomas, William, Zachary
Anna, Alice, Amy, Amber, Claire, Catriona, Chloe, Caitlin, Felicity, Frances, Grace, Gabriella, Hannah, Isabel, Jasmine, Katherine, Katie, Laura, Lauren, Leah, Megan, Madeleine, Matilda, Phoebe, Rebecca, Rachel, Ruby, Rosie, Sophie, Sophia, Victoria, Zoe