Shadrach is a name from a story in the Bible about three men who were not hurt by fire.
The word Shadrach is usually connected to the Bible and to being brave.
Examples:
Shadrach was a brave man in the Bible.
The story of Shadrach is in the Bible.
People talk about Shadrach in church.
I like the story of Shadrach.
Shadrach was very, very brave in the story.
Shadrach is a good name for a brave dog.