Why Nuh was called so..

عن يزيد الرقاشي قال:

إنما سمي نوحا لأنه كان نواحا

حلية الأولياء

It is said: Nuh Allayhi salam was called so, because he was nuwwaah*

The word نواح in Arabic is someone who constantly weeps and is in a state of mourning.

الله المستعان