In 1970, the top 20 boy names constituted almost 40% of all the male births.
In 2013, the top 20 boy names were only 15% of all the male births.
Modern names are MUCH more diverse.
Considering how overwhelmingly English the USA was 100 years ago, and how many different ethnic/linguistic traditions are now competing in the USA... I would not be impressed by modern parents' level of creative thinking. Also, it's part of the fashion now to name your kid something weird, whereas before it wasn't. By doing something "different" they are in a way conforming. And, I would like to have found better data to support this, but still it's pretty impressive that Jacob, which in 1970 was 253rd in popularity, and was often lower than 300th any year prior, is now in the top 50 of ALL living males
and, wait.. it's not even living males is it, it's all people born in the last 80 years alive or dead. So, that makes it even more noteworthy. and I'm speaking in relative terms, of course. I think you were taking my comment too literally.
So that just leaves kal, which is a fairly common morpheme across many languages, so certainty is going to be hard. I'd lean towards assuming the meaning of 'strong' from the Finnish, or perhaps 'King and God' from the Belgariad series.
How's that for too much attention kal?
John, Paul and George are there, but Ringo didn't even get his one song this time.
And a fun fact: Paul McCartney's first name is actually James.
Traditional variants do make things confusing as not everyone knows the John/Jack thing or Henry/Harry.
And do people even put the full names on certificates these days or just the name they want to use?