Discussion of names for our film

We decided to name our film 'The unknown', however it wasnt an easy decision. Whilst we watched our film back, we decided to write down words that came to mind whilst watching it, some of those being; dark, hidden, untold, concealed, secret and unrevealed. However we still werent quite satisfied with any of these ideas, so finally settled with 'The unknown'.
There is a famous film called Unknown staring Liam Neeson. The storyline is completely different to our thriller. It uses the word 'Unknown' in a different term. This film uses it more in the sense of confusion for a character were as we used the word 'Unknown' as the sense of the audience not knowing.

We thought this was a suitable name for our thriller film as one of the main themes throughout was the hidden identity of the antagonist.

Before deciding what we was going to call our film we thought of the name