Was Andrew Jackson the first US President to be impeached?

No, someone with a name sounding closer to him was.

Andrew Johnson, as Vice President of the United States, succeeded Abraham Lincoln when Lincoln was assassinated in 1865. President Johnson was impeached by the US House of Representative in 1868 but the resolution failed in the Senate by one vote. Still, President Andrew Johnson, a tailor by profession, became the first US President to be impeached.