Hanuman was fondly called “Sundara” by his mother Anjani and Sage Valmiki chose this name over others as the Sundara Kanda is about Hanuman’s journey to Lanka
What are the 7 kandas of Ramayana?
The 7 kandas of Ramayana are: Bala Kaanda, Ayodhya Kaanda, Aranya Kaanda, Kishkindhaa Kaanda, Sundara Kaanda, Yuddha Kaanda, and Uttara Kaanda