To change your company name in Australia, you must ensure the new name is available and not identical to an existing name on the registers.
The process involves passing a special resolution, lodging a Form 205 Notification of resolution with the Australian Securities and Investments Commission (ASIC), and waiting for approval. It's recommended to search the ASIC registers and check for trademarks with IP Australia to avoid infringement.
If the desired name is held by you as a business name, confirm you're the owner. For reserving a name, lodge a Form 410 Application for reservation of a name. Remember, changing the company name does not affect the legal name and if the ABN changes, a business name transfer is required.