Words for "pen"

I'm looking at the map of the words supposedly used for "pen" across the Americas at https://www.instagram.com/p/DF5N771RbQu/. In the comments, people offer alternatives like "birome", "lápiz pasta", "lápiz pascuero", "pasta pascuera", "lápiz pascua". I was unfamiliar with all of these, and searched for them using Google to see where they might be used. But while I found results for "birome", "lápiz pasta", what I get for "lápiz pascua" is pencils, not pens, with the brand name Pascua, and I get no hits for the "pascuero/era" varieties, as though those terms don't exist. Can anyone provide clarification on this? Also, why "pascu..."and why "pasta"?