Hittade den här lilla texten på Wikipedia om uppkomsten av just namnet Greenock:
"The origin of the town's name is uncertain. It is generally accepted, however, that the town is named after the Gaelic "Grianaig" meaning a sunny place. The suggestion that the town's name comes from the words Green Oak is folk etymology, but the image has been taken as a logo for the town's main shopping centre, The Oak Mall and was once emblazoned on the local Co-operative Society emblem. The story that 'Greenock' derives from 'Green Oak' is also perpetrated in a local song (The Green Oak Tree) and in the fact that the local dialect makes virtually no distinction between the syllables -ock and -oak. Significantly, no green oak appears on the town's coat of arms which features three sugar caskets, a sailing ship in full sail and three herring above the motto God Speed Greenock."
Här är en gran med blå ljusslingor och röda rosetter.