*siŋil

1 younger sister 2 younger brother

Proto-Turkic: *siŋil
Altaic etymology: Altaic etymology
Proto-Altaic: *sejŋi
Russian meaning: 1 младшая сестра 2 младший брат
Turkic: *siŋil
Tungus-Manchu: *seŋgi
Korean: *sjā'òŋ
Japanese: *sai ( ~ sia)
Comments: EDT 839, Лексика 311, ЭСТЯ 7. The original meaning was probably "younger sister of husband" (still observable in Old Turkic); note also the meaning "younger brother" in Chuv. and in Chul. siŋnim.
Old Turkic: siŋil 1 (Orkh., OUygh.)
Karakhanid: siŋil 1 (MK)
Tatar: sĭŋĭl 1
Middle Turkic: siŋil 1 (Abush., Pav. C.)
Uzbek: siŋil 1
Uighur: siŋil 1
Sary-Yughur: sɨŋnɨ 1
Turkmen: siŋli 1 (dial.)
Shor: siŋnim (Chul.) 2
Chuvash: šъll-ъm 2
Kirghiz: siŋdi 1
Kazakh: siŋli 1
Noghai: siŋli 1
Bashkir: hĭŋlĭ 1
Karaim: siŋli 1
Karakalpak: siŋli 1
Salar: siŋil, siŋni, siŋne 1