From Wiktionary, the free dictionary
কেই- • (kei-)
- (interrogative) how many [কেই (kei) + classifier]
কেইখন ছবি?- keikhon sobi?
- How many paintings?
(কেই-CLS painting?)
কেইজনী ছাগলী?- keizoni sagoli?
- How many she-goats?
- some [কেই (kei) + noun/classifier + মান (man, “amount, value”)]
কেইজনমান মানুহ আহে।- keizonman manuh ahe.
- Some men come.
(কেই-CLS-amount human come.)