大有人在

there are plenty of such people

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

there is much / (literary) abundance

there is a great deal of ... (typically followed by a bisyllabic word, as in 大有希望[da4 you3 xi1 wang4]) / (literary) bumper harvest; abundance

to have; there is / (bound form) having; with; -ful; -ed; -al (as in 有意[you3 yi4] intentional)

someone / people / anyone / there is someone there / occupied (as in restroom)

person; people / CL:個|个[ge4],位[wei4]

to exist; to be alive / (of sb or sth) to be (located) at / (used before a verb to indicate an action in progress)