St Stephens by Launceston Rural (EN) / Pluwstevan Lannstevan (KW)

Hundred: 
Notes: 
Amended Pluwstefan -> Pluwstevan
Elements: 

lann

Meaning: 
enclosure

pluw

Meaning: 
parish

Steven

This refers to the name of a person: 
name
Elements notes: 
<pluw> 'parish' + <Steven> personal name + <lann> 'enclosure (religious)'