Naming our second baby... Help!

My husband and I just found out we're pregnant again after nearly 2 years of trying, and we are due in early June 2022. We have a 3 yr old son, Killian Nicolas. We're having a hard time following up his name for either gender; specifically middle spots. We're obsessed with his name. Our families are European and Mexican so trying to find a name we both love that honors our heritages is challenging. We've decided on the first names Amelia for a girl or Maverick for a boy, but we have no middle spot for either name. Please help us with some suggestions!