Aww, Riley is such a cute name! Some of my mum friends have siblings with Riley, and they paired it with names like Jordan, Casey, Morgan, or Avery, lahat unisex at flowing talaga together. If you want something with a bit of Filipino touch but still works for both boys and girls, maybe consider Sage or Quinn? Both sound really nice with Riley and honor the international vibe without straying too far from what Paulo and Mary are going for.