As long as it's a distinctly different product category / market it's not a big deal. You can usually glean the meaning from the context pretty quickly. If one

As long as it's a distinctly different product category / market it's not a big deal. You can usually glean the meaning from the context pretty quickly. If one brand becomes large then the other one's can just have context added like appending "Norton" to Ghost. Or just say "Ghost blog service".