Which name for baby boy?

It’s getting closer to my due date (26 November) and we still can’t decide on baby boys name! We seem to be stuck between these two. Theo would most likely be Theodore but called Theo and Cillian is pronounced Killian. Theo seems to be getting more popular which puts me off a little. Cillian doesn’t have that issue but also not sure if there are any good nicknames I like and I KNOW it will get shortened with my family!

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