Where does “உள்ளங்கை” come from?

உள்ளங்கை (Tamil) comes from Tamil உள், from Tamil படு, from Sanskrit पट, from Proto-Indo-European pel- — to cover, to wrap; skin, hide, cloth; to fold.

Ancestry of “உள்ளங்கை”, step by step

உள்ளங்கை traces back through two separate lines of ancestry.

via Tamil உள்

Step	Language	Word	Meaning
1	Tamil	உள்	to be, exist
2	Tamil	படு	to strike, land on, fall on, touch, come into contact with
3	Sanskrit	पट	garment, piece of cloth
4	Proto-Indo-European	pel-	to cover, to wrap; skin, hide, cloth; to fold

via Tamil கை

Step	Language	Word	Meaning
1	Tamil	கை	hand
2	Proto-Dravidian	*kay	—

Every word from Proto-Indo-European pel- →Every word from Sanskrit पट →Every word from Tamil படு →