Do I have right to be mad/upset?

My SIL just announced she is pregnant with a little boy. I am thrilled for her as our sons will be only 6 months apart. However she has gone around and started claiming names. And it just so happened that she claimed the name that my husband and I had chosen for our son just with a different spelling and middle name. We have made it known that we picked this name for months now. Should I call her on the BS and do I have the right to be annoyed with her.

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