It's not just you. I have this same exact bug. I theorize, though I don't know for sure, that it's crashing because you're about to have a kid. I've gotten married every time, and it's always a little while after the marriage. 

So far all my children and all of those of other soveriegns have been girls...

Anyway, it would be useful to know the gender of the child when giving it a name.

In my only game so far I was married and had two sons.  If you thought the random name generator came up with some oddities for worlds, the kid names being pumped out are license to bullies everywhere to beat the crap out of them.

Well with 291 I can actually play a bit with dynasties.

My feedback right now is that everything seems like a rare random event. By the time I got married I could have my two opponents militarily had I chosen to.

I'd like the dynasty system to be more interactive and responsive early on. Something like if I park my sovereign in town I have a bonus in getting married or having kids. Maybe increased again if I build a palace. I'd like to be able to do SOMETHING to make stuff happen, or more likely to happen. A little more interactivity somehow.

OK, in my latest game I had a son (first born) come of age, and he showed up as unit in my capitol city.

Actually, after getting married, it will take at least 40 turns before you give birth to your first child, more if you are particularly unlucky that game.  It is also set so that you will not get married until at least 50 turns after the game has started.  These are just placeholder times to make sure that the events are considered "special," so you don't end up with dozens of child heroes running around about the time you finally research some good equipment for your designed units.  I think that, in the future, marriage will actually be quest-driven, and there will be ways to provide a bonus towards getting kids more quickly.

The way it is right now, only heroes get experience from a battle, while your trained units just send their experience on to the sovereign.  However, being that your kids ARE heroes, they should be getting experience...so it looks like you found a bug there .  We'll look into fixing that.

My custom sovereign is named Naba.  My eldest son, named Johol, has just come of age and joined me in my capitol.  However, when I bring up the tooltip for him, it seems to say his name is Naba, not Johol:

Is that a bug?

the ai seems to like going to war with me and sending all its peasents to my towns to be cooked alive which is most funny but its really stupid.

Game will crash randomly for me and most of the time the saves are screwed from the crash.