Considering the existing names Ivy and Maeve, here are some sibling name suggestions, categorized for different preferences:

Similar Style (Flowing, Nature-Inspired):

• For a brother: Rhys, Finn, Eamon, Rowan, Asher, Caleb
• For a sister: Willow, Hazel, Juniper, Gemma, Clara, Liora

Complementary Style (One Classic, One More Unique):

• For a brother: James, William, Henry, Theodore, Arthur, Samuel
• For a sister: Eloise, Genevieve, Theodora, Aurora, Coralia, Wren

Strong & Classic Names:

• For a brother: Liam, Owen, Ethan, Noah, Oliver, Elijah
• For a sister: Eleanor, Grace, Charlotte, Sophia, Olivia, Abigail

Modern & Unique Names:

• For a brother: Arlo, Jasper, Milo, Atticus, Felix, Ezra
• For a sister: Indigo, Lyra, Scout, Juniper, Willa, Sylvie

Names with Similar Sounds/Letters:

• For a brother: Gavin, Evan, Owen (similar sounds to Maeve)
• For a sister: Eva, Ava, Vera (similar sounds to Maeve and Ivy)

Considerations:

• Initials: Check the initials of the full names to avoid awkward combinations.
• Nicknames: Consider potential nicknames and whether you like them.
• Meaning: Research the meanings of the names to ensure they resonate with you.
• Flow: Say the names aloud together to see how they sound as a set.

This list provides a starting point. The best names will depend on your personal preferences and the overall feeling you want to create for your children's names.