Lucas, Liam, Louis, Elias or Matteo

Hi! I'm currently 26 weeks pregnant and thinking about a name for our first baby. We don't want to know the gender yet, so we're looking for names for both boys and girls. For a girl, we're considering Olivia, and for a boy, we're torn between these five names. Which ones do you think are the prettiest, and why? If you have any other ideas in a similar style, feel free to share! Thanks in advance for your help.