Literally "It’s good that you were born," commonly used as "Happy Birthday".
According to Turkish grammar rules (TDK), the particle in these phrases should be written separately. Correct form: İyi ki doğdun, iyi ki varsın, Emil. Ways to Respond Iyki Dogdun Iyki Varsin Emil
"It’s good that you exist" or "I'm glad you're in my life". Literally "It’s good that you were born," commonly
If you are Emil and received this message, you can reply with: (Thank you!) iyi ki varsın