Where does “দিলীপ” come from?

দিলীপ (Bengali) comes from Sanskrit दिलीप, from Sanskrit द्वि-द्वीप, from Sanskrit द्वीप, from Proto-Indo-Iranian dwiHpás, from Proto-Indo-Iranian Hā́ps, from Proto-Indo-European h₂ep- — water, body of water.

Ancestry of “দিলীপ”, step by step

Step	Language	Word	Meaning
1	Sanskrit	दिलीप	name of various kings, especially of
2	Sanskrit	द्वि-द्वीप	—
3	Sanskrit	द्वीप	island, peninsula, sandbank; division of the...
4	Proto-Indo-Iranian	dwiHpás	island
5	Proto-Indo-Iranian	Hā́ps	water
6	Proto-Indo-European	h₂ep-	water, body of water

Every word from Proto-Indo-European h₂ep- →Every word from Proto-Indo-Iranian Hā́ps →Every word from Proto-Indo-Iranian dwiHpás →