Am I wrong for wanting a name that is similar to theirs?

I am having a dilemma... My brother and his girlfriend had a baby a year ago (in Oct) and named her Juliana. My husband and I are having our first child (a girl) this Oct. and want to name her Liliana. We love the name yet I am afraid my family will think the names are too close (too alike). (My brother's girlfriend had already accused one of her friends of "copying" their name when they decided to name their daughter Eliana). I don't want to cause friction within the family or make it confusing for family members by having similar sounding names... We are close to my family and see them regularly.  What do you think? Is there name etiquette within the family? :-/