Happy Arabia (sometimes Felix Arabia) was the name previously used by geographers to describe what is now modern-day Yemen. Yemen ( Arabic: اليَمَن al-Yaman officially the Republic of Yemen ( Arabic: الجمهورية اليمنية al-Jumhuuriyya
The southwestern corner of the Arabian Peninsula, enjoying more rainfall, is much greener than the rest of the peninsula and has long enjoyed much more productive fields. The Arabian Peninsula (in Arabic: شبه الجزيرة العربية šibh al-jazīra al-ʻarabīya or جزيرة العرب jazīrat al-ʻarab)
And this explains the name: The term "Happy Arabia" is a translation of the Latin "Felix Arabia. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. " It was only in later, classical Latin that "felix" meant "happy. " Originally it meant "fertile or productive," and it was in this sense that the term was employed.