กุญแจ (Thai) comes from Malay kunci, from Hindi कुंजी, from Punjabi ਕੁੰਜੀ, from Prakrit 𑀓𑀼𑀁𑀘𑀺𑀬𑀸, from Sanskrit कुञ्चिका, from Sanskrit कुच्, from Proto-Indo-Iranian *kawč-.
กุญแจ (Thai): key; lock; padlock