Pupicek and other such names

[RonButters at AOL.COM]

In a message dated 7/29/2002 3:32:33 PM, stevekl at PANIX.COM writes:

<< I had an imaginary friend when I was about 4, named Pupicek (belly
button). >>

Is the -ek a genitive ending? so that "Pupicek" would be 'offspring of
Pupek'? I had real friends who were named Stepanek, Lofek, Vandreshek, and
always assumed that the -ek was like the -son of Swedish names.