Would you use a name your sister "staked claim" on?

Emmie • DS 3/24/15 - baby 2 due 10/30/17
My SO has loved the name Wyatt for 10 years, when we were naming our first we both had Wyatt on our lists and mentioned it to my sister who said we couldn't use it, it was her name. We're naming baby boy 2 and my SO insists we use Wyatt because he has loved it forever and we can't agree on anything else. I don't know what to do. I'm torn.

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