In “The Wicker Man” – 1973, the characters are all named either after plants or seasons. This is due to the reversion of the summer islanders to Celtic paganism.

Instead of having traditional Christian Scottish names like "John" or "Anne" or "David" all the characters born after the reversion are named after trees or plants. In this example we can see the grave of a man named Beech Buchanan, who's presumably an ancestor of another character, Ash Buchanan. We also have May Morrison with a daughter named Rowan, a man named Oak, a schoolteacher named Ms. Rose, and a landlord named Alder MacGregor with a daughter named Willow to name a few. If anyone else knows any more examples in the Wicker Man of this that I missed please let me know. Just found this really interesting.