An interesting development in Vandal Africa was the tendency to use mixed names - combining Germanic suffixes and elements with Latin, Punic, Greek, Berber names and vice versa. An example would be the Vandalic feminine name - Muritta: it's a combination of the name Maurus and the East Germanic suffix -itta; another example is Cyrila which is a Vandalic feminine counterpart to the Greek name Kyrillos. You had similar developments in the Lombard Kingdom when you had a much greater proliferation of mixed names. If Roman reconquest of Africa is aborted, this trend would've continued with the Vandals and perhaps would've spread to the other post-Roman Germanic kingdoms.
Do you have a source where I could read more, by any chance?
In the US, President's names were once more common as well, but I don't see that much in current use. Roosevelt, Washington, Lincoln, etc were more common a generation or two ago. I personally haven't encountered any Clinton's, Bush's, or Reagan's so far. Might we see a generation with Barak, Obama, Trump or Hillary as a common name?
Were those really that common in the US? I think they were more common in Latin America (especially Brazil) than in the US proper, although I know they were used here as well (Lincoln especially).
I don't think you're ever likely to see anyone named Bush after the presidents, since Bush I is considered pretty mediocre and I don't think Bush II has a positive reputation amongst anyone nowadays (even conservatives tend to think he was pretty mediocre). That said, I'm amazed there aren't more people named Reagan considering his popularity amongst certain segments of the American populace.