what multiple sources say, there is no record of the name Deena meaning "valley".

Some notables name Deena include:

Women:
* Deena Aljuhani Abdulaziz (born 1975), Saudi Arabian princess
* Deena Deardurff (born 1957), American retired swimmer
* Deena Dill, American actress and executive producer
* Deena Horst, American politician, member of