similar sibling name sets

I am very interested in 2 unique names but unfortunately I know someone else, not very well though, with children with the same 2 names. What do you think of using these 2 names for my own children?

Ask that person! They would be flattered. I had an uncommon name growing up, and when somebody I knew used it for their child without mentioning it to me, I felt like they ‘stole’ my name! But if they would have complimented me on it, and asked if I cared if they used it too, I would have been honored! As far as retaining your names ‘uniqueness’, I wouldn’t worry about it. Undoubtedly, somebody will hear your special names and think they’re special too!