Inyokoni is a local kamba name derived from the word inyoko which means a swampy area or a place with plenty of water.
Inyokoni secondary school was started in 1974 as a public school under the auspices of African Inland Church supported by the local administration (the chief’s office).
It opened with 34 students and 2 volunteer teachers from the immediate community.
There were two classrooms borrowed from Inyokoni primary school.
In 1988 the school collapsed only to re-open in 1990 under the patronage of Rev. Frof. Jones kaleli. Since then it picked up very well and has made continuous progress.
The school has grown to a double stream with the current enrolment of 386.