Are Celtic and Germanic languages in common?

Celtic languages had more in common with Latin than with Germanic, however due to neighbourly relations ;] they seemed to have shared quite a number trade words.

The Celtic and Germanic languages didn't have much in common.

Yes.Danish is a Scandinavian tongue which belongs specifically to the North Germanic language group.

French, Russian, Chinese, Japanese, Spanish, etc. etc.

There is no one Celtic language. Celtic languages (with an 's') are a group of languages ariginating in Europe. Germanic languages are a group of languages also originating in Europe and include...