[Portland, Maine] was formally founded in 1786 and named after the English Isle of Portland. In turn, the city of Portland, Oregon, was named after Portland, Maine.
I failed at finding how the Isle of Portland got its name but saw this:
In Dorset, England:
The origin of the name “Portland” on the Isle of Portland is uncertain, but theories include:
It may be a corruption of the Celtic word “Port Lann” (“harbor by the cliff”).
It may derive from the Old English “portelond” (“land by the harbor”).
Going down a Wikipedia rabbit hole:
I failed at finding how the Isle of Portland got its name but saw this:
https://etymologyworld.com/item/portland
Its the first time I’ve seen the site though and that page feels a bit AI generated
That’s a little disappointing.
Inland port -> Portland seemed nice and tidy