“Many MO’s do give their kids jewish names, Just not Yiddish names Like bearish or Fraida. They will give them more Hebrew names like Moshe or Chava”
In my experience it has been the MO who have had the most unusual combinations of Yiddish names, such as Zanvil Shepsil or Chuna Freydil or so on. I suspect it is so because they give the names they may remember from some old grandfather on one side and another on another side. They really don’t note the discordance of the combination since they have no intention of ever calling the child by anything other than a secular name.