Porthilly (cove) (EN) / Porth Hyli (KW)

Hundred: 
Elements: 

hyli

Meaning: 
brine, salt water

porth

Meaning: 
cove, gate, harbour
Elements notes: 
porth 'cove, harbour' + hyli 'salt water, brine'
Historic forms: 
Porthillieglos, Porthylligres 1284. Porthilly 1296, 1299, Porthillieglos 1354. Porthylly Gres 1541.