St Mawes Castle (EN) / Kastel Lannvowsedh (KW)

Hundred: 
Elements: 

kastel

Meaning: 
castle

lann

Meaning: 
enclosure

Mowsedh

This refers to the name of a person: 
name
Elements notes: 
<kastel> 'castle' + <lann> 'enclosure (religious)' + <Mowsedh> personal name