In Croatian, September is called Rujan, meaning red month (leaves turn red before falling).
In Czech, September is called září, meaning glow or shine.
In Finnish, September is called syyskuu, meaning autumn month.
In Polish, September is called wrzesień, month when calluna flowers emerge.
In Tigrinya and Amharic, September is called meskerem which is also the month when the yellow flowers of the same name blossom marking the beginning of the New year according to the ancient Christian orthodox calendars of Eritrea and Ethiopia as well as the start of the greatest harvest season in most parts of both countries.
In Turkish, September is called Eylül, (Arabian - eylûl), syriac-Arabian 'aylûl' means 'Grape'. Thus the meaning might be "Grape Month". Another, more likely, possibility might be from the Hebrew month Elul.