来い is read as こい (koi) and means come!.
こい
koi
らいねん
next year
らいにち
arrival in Japan
らいげつ
next month
らい
next (year, spring, etc.)
くる
to come to (e.g. "when it comes to spinach ...")
らいきゃく
visitor
らいしゅん
next spring
らいしゅう
next week
らいじょう
attendance
らいせ
afterlife
(incoming) attack
らいひん
guest