Porch vs Portico

Porch

name

  • The Stoic philosophy (after the public porch on the agora of Athens where Zeno taught). 

  • A surname. 

Portico

name

  • The Stoic philosophy (after the public porch on the agora of Athens where Zeno taught). 

How often have the words Porch and Portico occurred in a corpus of books? (source: Google Ngram Viewer )