Catholic/Orthodox: Saints of all stripes, with a much lesser emphasis on concepts/objects.
Episcopalians: Religious events (Ascension, Annunciation, etc…), items/concepts(Holy Cross, Good Shepherd, etc…) or “big” saints/figures (St. Mary, St. Matthew, etc…). Not a lot of “St. Elphaba of the Pointy Hat” kind of obscure lesser saints.
The rest seem to be big on where they are- “<town name/neighborhood> Church”, followed by biblical places, with a lesser emphasis on the big Biblical figures, events or saints.
Basically, I think you’re right. But to distinguish between those two, Catholic church names are more likely to be for Mary and her various incarnations (Lourdes, Fatima, Guadalupe, etc.) than Eastern Orthodox.
Most Catholic church names are saints, but it’s not universal. I’m familiar with Catholic churches named “Holy Rosary”, “Holy Family”, “Trinity” “Holy Name”, “Christ the King”, “Servant of Man”, “Resurrection”, and “Transfiguration”, just for starters.
“I’m a faithful follower of Brother John Birch and I belong to the Antioch Baptist Church and I ain’t even got a garage, you can call home and ask my wife!” Uneasy Rider (1973)
Charlie Daniels Band
Probably so, at least here in the US. In my moderate European travels, I’ve noticed a definite habit of naming churches for ancient and obscure local saints. I mean, who was St. Reparata? St. Frideswide? St. Bavo? (to name 3 fairly famous churches named for obscure saints that I remembered off the top of my head) And I know that it’s totally likely that all of them were probably named that in the 7th century or something.
There are a LOT of “Santa Maria della ” churches in Italy for sure though.