The word "宿豫" is formed as a place name by combining the character "宿",取自 the ancient Su State that historically governed the area, with "豫",取自 the ancient Yuzhou province, to denote the region's historical and geographical origins.
Word Definition - 宿豫
sù yùSuyu district of Suqian city 宿遷市|宿迁市[sù qiān shì], Jiangsu