Where does “icayi” come from?

icayi (Rwanda-Rundi) comes from Swahili chai, from Persian چای, from Hindi चाय, from Middle Chinese 茶, from Chinese 茶, from Proto-Loloish la¹, from Proto-Sino-Tibetan s-la — leaf; tea; flat object.

icayi (Rwanda-Rundi): tea

Definitions

Ancestry of “icayi”, step by step

Step	Language	Word	Meaning
1	Swahili	chai	tea; breakfast; a bribe
2	Persian	چای	tea
3	Hindi	चाय	tea; cup of tea
4	Middle Chinese	茶	—
5	Chinese	茶	tea
6	Proto-Loloish	la¹	tea
7	Proto-Sino-Tibetan	s-la	leaf; tea; flat object

Every word from Proto-Sino-Tibetan s-la →Every word from Proto-Loloish la¹ →Every word from Chinese 茶 →