Usage patterns
〈物〉に題名をつけるto give a title to something
It took a while to come up with a title for that movie.
題名を決めるto decide on a title
I couldn't decide on a title for my novel for a long time.
題名が〈形容詞〉the title is (adjective, e.g. long/catchy)
That book's title is long and hard to remember.