Can I still use this name?

The name Lillian has been on my list for quite some time, and it is probably the only name my husband and I can both agree on. However, a coworker that I would consider a work friend and speak to/work with frequently is having a baby a few months before me and naming her Lilliana. Both of us would likely use the nickname Lilly. Is it weird for me to use Lillian? I want to talk to her about it soon, but figured I’d get your opinions first. I have 4 more months to go, so plenty of time to pick a new name. Thoughts?