Sometimes I think it is a danger to read too much into names. We often "assume" William will call his son William, or because his Dad was James then the family with son called James is more likely to be "ours" than another. Often this is the case, and looking at names can give sway our thinking alongside other circumstantial evidence.
But often there are names that appear in our trees that, on the face of it, come from nowhere. They must have just been a name that had particular meaning to the family at that particular time, or that they had seen or heard somewhere and just liked. Alongside the regular Williams, James, Thomas, Elizabeth, Mary and Annes that many of us see over and over again, we see that other names did come in and out of fashion - like Philadelphia etc.
Around the turn of the 19th to 20th century, all sorts of names came into play - and I can imagine the older generation being shocked at these new fangled names! Percy, Reginald, Leslie, Victor, Norman, Edith, Winifred, Lillian, Vera etc. And ever since then, new names have appeared, with some staying popular over time, and others just having a brief season of popularity, so that you can almost guess the approx age of someone with that name.
I remember the horror amongst the older people in my family when the youngest generation started arriving and were given 21st century names. But then, when I thought about it, those people desparing of the "newfangled" names were called Jean and Eileen, both popular names in the 1920's, but before that they werent, so when their parents chose these names they must have been equally unusual and "newfangled" to their older rellies!
It is an interesting subject - well I find it so!
But I still wonder why in one of my families, (full of the usual names of George, Sarah, Francis and Richard as per generations before), with no known Scottish or Irish connections, they suddenly named one little boy Fergus Duncombe O'Connor Moon! Por little chap did not live long, and they reused the name Fergus for the next baby boy, but without the fancy middle names, who did live to adulthood.