[nilstycho]

I like the idea of union names [1].

If you're AC and your partner is BD, then on marriage you choose a new name X. You become AXC and your partner BXD. Your child is EX. Then each child has equal connection to both parents. The cost is that you lose the deep history of names, but that history only existed for a single lineage anyway, so it's not as important as it seemed.

(1) https://nothingismere.com/2013/11/12/solve-surnames-with-uni...