I couldn’t answer about Galitzianers, as my paternal side is Litvish and maternal German.
That said, I grew up in close proximity to many paternal cousins of my generation. There were 6 boys born in early 1954. All of us were named for our paternal Great Grandfather A”H who had died in December 1953. Rather than having mass confusion when mother, grandmother, aunt called for Yitzhak to stop playing ball and come inside, we were all called by our middle names (which were all different from each other). Only when signing our names, in yeshiva, or after Bar Mitzvah when being called for an aliyah are we called by our given first names.