I'm aware this is super petty and not a huge deal but it's really bothering me 

We visit my SIL all the time. She's just gotten a puppy and decided to name it a name almost identical to my DDs name, bar one letter. The names sound the practically the same and we often get confused who is being referred to. AIBU to wonder why, seeing as there is billions of wonderful names out there, she had to choose DDs? Would you be annoyed?