Watergate Bay (EN) / Porth Tregurien (KW)

Hundred: 
Elements: 

porth

Meaning: 
cove, gate, harbour

trega

Meaning: 
enclosed farmstead, settlement

Urien

This refers to the name of a person: 
name
Elements notes: 
<porth> 'cove, enterance' + <trega> '?enclosed farmstead' + <Urien> personal name
Historic forms: 
Tregorrian Cove 1699 Watergate Bay 1813 Watergate Bay 1826 Watergate Bay 1830 Watergate Bay – 1st Series OS Watergate Bay – Current OS Tregurrian or Watergate Beach – Current OS