kaien is the masculine singular definite of kai.

kaiN

Kven

1kaajaN

2laituriN

3prykyN

4kaiaN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:30373Edit on GitHub Suggest

káijaN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:43759Edit on GitHub Suggest

Case	Sg	Pl
Indef	kai	kaier
Def	kaien / kaia	kaiene