What does 来 mean?
来 is a Japanese prefix meaning “next, coming (prefix)” in English. It can also be translated as “since, as in since last month” depending on context. It is written as 来 in kanji, らい～ in hiragana, and rai～ in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
来年末までで、ここで働き始めてどれくらいの期間になりますか。
How long will you have been working here by the end of next year?