Today this is almost only a surname, read Jiǎng. Originally it named 茭白 (wild rice, water bamboo); that botanical sense, read jiāng, is archaic and rarely seen.
The grass radical on top reflects the character's original meaning, a water plant (wild rice). The everyday surname use keeps the radical even though the plant sense is now archaic.
Leader of the Republic of China and the Kuomintang who fought the civil war against the Communists, then ruled Taiwan from 1949 until his death in 1975.
