Boy:

• European Options: Alessandro, Lorenzo, Matteo, Leonardo, Antonio, Luca, Emilio, Federico, Giacomo, Sebastian. Consider names with strong, classic feels to complement Oliver and Franco.

• Mediterranean Options: Angelo, Nico, Marco, Dante, Giovanni, Alessandro (already listed above, but fits here too), Raphael, Stefano. These often have a warm, sunny feel.

• Slavic Options: Dmitri, Boris, Ivan, Nikolai, Pavel, Slava, Vladamir, Maxim. These offer a different cultural perspective, often with strong, historical connotations.

Girl:

• European Options: Isabella, Sofia, Aurora, Emilia, Giuliana, Luisa, Clara, Violetta, Theodora, Genevieve. These names tend to be elegant and timeless.

• Mediterranean Options: Elena, Sophia (similar to Sofia), Alessia, Bianca, Chiara, Francesca, Isabella (already listed above, but fits here too), Lucia, Olivia. These often have a softer, more melodic sound.

• Slavic Options: Irina, Natalia, Olga, Svetlana, Yelena, Anastasia, Milena, Zoya, Lyubov. These names often have a unique and beautiful sound.

Considerations for Combining Names:

• Sound: Pay attention to the flow and rhythm when saying the names together. Do they complement each other phonetically? Avoid names that sound too similar or clash harshly.

• Length and Syllables: A mix of short and long names, or names with varying numbers of syllables, can create a nice balance.

• Initial Letters: While not crucial, consider whether the initials create a pleasing combination.

• Style: Aim for a cohesive style across the names, whether it's classic, modern, or something else. The existing names, Oliver and Franco, lean towards a classic European style.

• Meaning: If you're interested in the meaning of names, research the etymologies of your choices to ensure they align with your preferences.

This expanded list provides a broader range of options, allowing you to consider various cultural influences and stylistic preferences while maintaining a sense of harmony with the existing names, Oliver and Franco. Remember to choose names that resonate with you and your family.