Perhaps Gertrude would name her son Eudes or Lambert.
Now I think, probably, it will be Lambert.
Thanks!
So she would need a special reason to give to some of her children the names in memory of her ancestry. I don't know - pilgrimage to Kiev? Some ilness which would be cured by interference of saint Yaropolk?
Maybe, names will be same, as in OTL? It's some less interest, but needn't new PODs, it's seems.
Also quite probable later. I think that the house of Shweinfurt didn't have objection against marry the woman of this family into slavic royal houses.
But, it's seems, Judith is rather old for sons of Sviytopolk.
From another hand - is it known, in which year his wife died? Ingegerd died about 1050, but the wife of Sviatopolk can die earlier, and then Sviytopolk himself marries Judith.
In this case, it's seems logic, that Cazimir will "kind" to Spytihnev and set him as the governor of Mazovia and give him his daughter (in TTL Casimir had one more daughter, because he married Dobronega earlier). they are not to close relatives: Daughter - Casimir - Mieszko - Boleslav I of Poland - Dobrawa - Boleslav I of Czech - Boleslav II - Oldrich - Bretislav - Spytihnev.
And two more sons of Judith will have cities Brest and Grodno from Sviytopolk, maybe?