Bloch, along with his brother Richard, started the business as the IRS was phasing out its free tax prep service. They changed the “h” in their last name to a “k” so it would be easier to pronounce
Article source: https://www.npr.org/2019/04/24/716641448/henry-bloch-co-founder-of-h-r-block-dies-at-96?utm_medium=RSS&utm_campaign=news