Where does “kùli” come from?

kùli (Kashubian) comes from Proto-Slavic koliko, from Proto-Slavic kolikъ — how big.

Ancestry of “kùli”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	koliko	how much, how many; neuter of *kolikъ
2	Proto-Slavic	kolikъ	how big