Let's see. Here's a list of the ones that are most clearly past life acquaintances off the top of my head. I'll add a note to clarify my thoughts on each.
My best friend, Mika. (on another continent, but closest emotionally) We each have different perspectives on the same life's memories. Hers was a dream from ten years before, then I shared an interesting PL meditation experience with her and she told me about having had the same dream, with her own unique details years before.
I remember multiple other lives with her and another mutual acquaintance who she has been friends with for longer than she has known me. We think that friend has met another individual that all three of us have shared lives with, so Mika and I are watching their friendship develop with interest and hoping we'll have a chance to meet them and test our theory.
My ex husband turned out to be "my father who murdered me" in a PL memory of him, and also an abusive boyfriend in another memory of him. No wonder that attraction didn't work out so well. Feeling drawn to someone because you're somehow "immediately connected" doesn't mean you're "meant to be together" ... just in case you're wondering. Soul mate? Whatever. That connection can be felt with people who treat you well and appreciate you, and with those who don't.
Three different men I considered dating in the past few years. I think they were all boyfriends or close somehow in my most recent previous life. (I seem to have been close to a lot of men in that one.) A few came with flashes of other lives. Nothing too clear. The reason I'm certain is because I felt like I knew them the moment we met. I'm still friends with all of them even though we agreed that this life isn't meant to be shared as partners.
A young man I met a couple years ago. I never thought of dating him, but we definitely connected and I keep an eye on his life and look for ways to encourage and mentor him if needed.
Two of my local, female friends were probably acquaintances from previous lives, though I don't have specific memories or even a strong sense of familiarity. They've both suggested that they feel like we've been sisters and friends before. I've always gotten along well with them and wanted to get to know them better from the start, for my part.
The grandma of a good friend (who visited him when I was in middle school) was clearly someone from a PL in retrospect. (Even though it was before I even knew about reincarnation.) I think I might have spent more time with her during that visit than he did.
It's hard to guess, but some of my compulsive attractions as a teen were probably because the guys (and one or two girls I wanted to be BFFs with) had a PL history with me, though they weren't attracted themselves. It's hard to guess, because crushes are crushes and I don't remember any glimpses of specific memories. Some were a bit obsessive on my part, and lasted well into adulthood. Even now I'm more interested in their lives than with most people, even though I no longer feel any inclination to be close to them.
A famous actor (who need not be named) is someone I rescued after horse-riding related, life-threatening injuries in at least two lives. In one he was an elderly mentor who kept me safe till he died of a heart problem, and in the other I think I ended up being murdered for witchcraft charges somehow related to the way I helped him recover from his injuries. *shrug*
If you think about it, there are a lot of people who we've encountered in all our potential lives. It's not surprising to run into them and feel that sense of recognition at one level or another. I think the ones we've shared many, many lives with are more rare but certainly not limited to only a few.
Mika and I are unusually aware of our shared history, and it helped us understand why our friendship has always been so strong and trusting from the start, but I don't think we needed to remember to be this close, if that makes sense.
A note on soul mates:
Obviously not all the people we meet are going to become healthy relationships. Just because we spent a lifetime trying to make them happy and didn't succeed then (or even if we did) it doesn't mean we're going to be close in the same way this time around. People need time to become capable of the connections we offer sometimes. They especially need to learn to be healthy in relationships themselves, first.