Where does “تو” come from?

تو (Urdu) comes from Sauraseni Apabhramsa तुहुं, from Sauraseni Prakrit 𑀢𑀼𑀫𑀁, from Sanskrit त्वम्, from Proto-Iranian tuHám, from Proto-Indo-Iranian túH, from Proto-Indo-European túh₂ — you, thou.

تو (Urdu): you, thou

Definitions

you, thou

Ancestry of “تو”, step by step

Step	Language	Word	Meaning
1	Sauraseni Apabhramsa	तुहुं	—
2	Sauraseni Prakrit	𑀢𑀼𑀫𑀁	you
3	Sanskrit	त्वम्	you, thou
4	Proto-Iranian	tuHám	—
5	Proto-Indo-Iranian	túH	you, thou
6	Proto-Indo-European	túh₂	you, thou

Every word from Proto-Indo-European túh₂ →Every word from Proto-Indo-Iranian túH →Every word from Proto-Iranian tuHám →