Yeeees. ‘Barry Island’ was, but isn’t. ‘Isle of Dogs’ isn’t, but is so named.
when I was a teenage I once opened an OS map of the Wirral
and followed all the waterways - rivers and canals and the like
and discovered that technically it was possible to define The Wirral Peninsula as an island as you could not get to it without crossing water
I did have to follow the map quite a long way towards Chester but I did trace water all across the "landward side" of the place
I was an only child and there were no other kids I knew anywhere near where I lived
and it was probably raining