The name opens with 21, the figure every Bitcoin reader links to the fixed supply of 21 million coins. Bitcoin follows as the plain subject, and group closes the name with a word that implies several units, shared governance and a balance sheet behind them. All three parts are English and widely understood. The .com ending addresses a global commercial audience and is the address most people type first when they hear a company name spoken aloud.
Strategically the name belongs to the brand category: it does not commit to one product line. That openness helps a holding company that bundles mining, custody and education, an investment club that formalises into a firm, or a venture studio launching several Bitcoin start-ups. It also works as the umbrella above existing product brands, carrying investor relations, careers and press pages for the whole organisation.