Basically what @toastofthetown said - it’ll be 1920s/30s ‘Agatha Christie’ style names next. Harder, more substantial names for girls - DD’s toddler groups are full of interchangeable Eliana/Ariana/Alyssa/Aurora/Isla type names and they’re already sounding dated. I predict they’ll be replaced by little Dorothys, Hazels and Friedas soon. Margot, Mabel, Edith and Olive are already popping up a lot where I am. For some reason I can see Sylvia coming back in a big way. Lots of 1930s boarding school names!
Also lots more nature and word names for both girls and boys - more unusual nature names (Maple, Cedar, Aster, Zinnia, Clover) and aspirational ‘idea’ names like Pax, True and Ever that sound weird now but will become much more mainstream.
-o endings for both boys and girls will continue to be popular, with Arlo, Milo and Theo being joined by others like Otto and Jago, plus Cleo and Juno for girls. Also more solid, ‘Enid Blyton’ style boys names like Peter and Laurence/Laurie coming back into fashion.
And I agree with the German/Scandi name prediction, which also ties in with the ‘harder’ girls’ names idea.