You need to invent your own names if you're going to be a writer. Don't depend on some anonymous person on the internet to invent your characters for you!
I use online name generators for the names of my secondary characters - the main characters. I take my time and choose special names from baby name books!
Writers who copy ideas from other people can also end up in trouble for plagiarism! If you copy someone's names or ideas, then when you publish your story, they could claim you stole those from them and sue you for part of your money.
Click on the LINK for a character name generator!
Goon Detective Agency should be good enough.
femtect
"Blue Moon Detective Agency"
Lord Lister Detective Agency is the fake detective agency Helmuth and Rudi make up.
Think about your story - what is going on and who are the people involved? Think of something about the mystery in the story, or something about the detective. Check out the Related Questions for help with your book, too! some of the most famous Aurthur's write the story then come back to the name.
einstein
Pinkertons
The title comes last -- finish your story and you'll find your own title.
The secret agency
The noun 'detective' is a common noun that is capitalized only when it is the first word in a sentence. A proper noun is always capitalized. The noun 'detective' is a proper noun when it's a title, as in Detective Jones, or part of the name of an organization, as in Jones Detective Agency.
The mystery of mysteries
his name