Funny enough, I think it’s common for the female middle name to be a mom/grandma/aunt name.
Is it a specific cultural thing I wonder
It's apparently not an uncommon tradition in several areas of the world to either have either the first or middle name be shared, and then a unique name for the unmatched one (e.g. John Alan Doe, John James Doe, John Matthew Doe - Alan John Doe, James John Doe, Matthew John Doe).
My son was born in a country with doesn't write those in a birth certificate. When we went back, guess what -- they still added it by deriving it from my name.
Not every society wants to be modern.
Modern society cuts family ties which is a lot of times not so great, but on the other hand it saves lots of people from abusive relationships.
Once you can leave abusive parents or siblings, whole world of opportunities opens. Then again on the other hand not everyone can deal with such a freedom.
Yet still I am personally supportive of modern approaches where people can choose their destiny and not being tied to a family legacy.
I'd rather see the name of the father be stuck to the kid so if he's a failure, everyone knows who failed him.
Therefore, you just invite confusing answers and useless discussions in your reply.
So while there is a bias towards mother custody of the kids (around 2/3), there is still 1/3 of the kids where it is not the case.
Also, not having full custody of kids doesn't mean the father is leaving completely from the kids life. More often than not the kids need to stay with one parent because job and cost of living forces them to be more regionally apart (only 37% of kids living in same town). That doesn't mean the father do not see the kids in the weekends/holidays nor contribute financially to study.
So the reality is way more nuanced than you make it out to be in a small comment.
Why do you frame it as only fathers can fail children? Or only men can do wrong? Women can pay for studies as well, and have just as much duty to their children.