Baby name blues

My Boyfriend and I became pregnant unexpectedly with twins and we are so excited. We had quite a few boy names picked out but were having a hard time with girls names so I kind of hoped they would both be boys. Of course at our 16 week u/s we found out they were both girls (So excited, I couldnt imagine them being boys now at all!) and as soon as they confirmed twin b was a girl the name Addison came up in my head. BF and I are huge cubs fans and I also loved the name Ivy but didnt want to use it as a first name, but Addison Ivy was perfect and we decided on that name definitely. Later that day we announced the pregnancy and told his parents the one name we picked out. they didnt seem too into the name and we got some questions about it but we were very decided because we were having such a hard time coming up with girl names we both liked. After 3 months her name became pretty special and we soon started refering to Baby A as Addison. My BFs dad went around telling everyone the good news and (I dont know for sure) most likely the name we had picked. We had a few other names for Twin B but nothing was really sticking... naming two girls is hard and we are both so picky! It doesnt help that his last name is Lindsey which is difficult to match with in the first place. I didnt think anything would happen and was so focused on finding another name to match when we got a phone call from my BFs cousin that her brother had decided to name his baby(due a month before our twins) Addison Joy with the intention to call her AJ. :/ She told him that we had that name picked out for months now and he replied that he didnt care, he was using it anyway. They claim they didnt know we were planning to use it, which could be true, I dont know, but they all bowl together every other friday and I really doubt they never heard my BFs dad talk about the name before. Regardless of if they heard the name from us, and I will admit that it is a more popular name then I originally thought, the fact that they had no respect for us and said they didnt care is what hurts. They already have 6 other girls (yes six.) and I had given up one of my favorite names, Audrey, because they already had a daughter named Aubrie and I was told it was too similar. I dont understand why they couldnt come up with another name that started with an A if their intention was to call her AJ either. :/ His cousin who told us didnt understand why I didnt want to still use the name. I decided to come up with an different name, maybe it will be easier to come up with both of them if we dont have one picked out already. I cant help but feel a little heart broken about losing the name, just because it felt so special to my BF and I. Its been a few days now and I thought I would be over it but but I keep thinking about it and its making me sad. I vented to my mom, sisters, and friends and they had kind words and name suggestions even though most of them thought she was jealous we were having twins and probably did it on purpose. I dont think that is true but after hearing it from enough people its starting to bother me. My BF and I are in our early 20s and are not married, though we plan to eventually, and that was also brought up because we have gotten some grief from his family about it. I dont know what to think only that I hope his family isnt so petty, though previous family drama disagrees... I still dont plan to use the name because cousins born a month apart with the same name is too much imo, my daughter would already be sharing a birthday and there is no garentee their daughter would actually go by AJ. I just needed another outlet to vent to, I know Ill be over it and will love the names we come up with, I'm just hurt and feel disrespected.