I don't think they have any special significance, they are just Finnish names.
It's a different story with "Aino" and "Väinö" though, since they are a nod towards Kalevala (alongside with "kantele" and "velho").
"Anna" and "Elsa" are probably here because of Frozen...
The name "Juho" could also be seen as the equivalent of "John", but there are actually many other such names that derive from the same source.
There is this tradition in many Finnish schools that young children who begin learning a language - English, German, French etc. - get a name in that language, a name which is then used in class. Nowadays children often get to choose their names, so the names don't necessarily resemble their Finnish etc. names (you might get four children that have the same name if it's someone popular, like a footballer, they all like) but sometimes teachers are the ones to pick the names and choose names that are the equivalent of the names the children have. My brother, who is called "Juho" got to be "John".