welcome to GoY.
Do you mean plants with the name Christopher. such as Allium cristophii
or varietal names ? eg
Rosa Christopher, Clematis Christopher

Christopher comes from the Greek meaning the 'bearer of Christ'
pop this in your search engine for more ideas

http://apps.rhs.org.uk/rhsplantfinder/pfgenera.asp

also some plants have a common name eg
Aconitum lycoctonum - common name is "Christopher's herb".

Osmunda regalis (Osmunda regalis L.) - common name is "herb Christopher"