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Heidi & Oliver for siblings doesn't seem 'off' in the slightest to me. They are both 'cute' (in a good way), and recognizable but not overused or trendy.

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Other suggestions:
Johanna
Lucy
Christa
Mariel
Suzanne
Joy
Gretchen
Eliza

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Leo
Stefan
Anton
Oscar
Toby
Kirby
Troy