GRACIE. >:D
No, the names don't need to be Japanese but they will be drawn in manga style in order to keep with the origins of the meme explained below.
To put this whole "-tan" idea into an understandable expression...-Tan is another way of using the suffix -chan (is a mispronunciation of Chan (ちゃん?), an informal, intimate, and diminutive honorific suffix for a person used for friends, family, and pets).
The OS(Operating System)-tan is an Internet meme that originated within Futaba Channel. The OS-tan are the "moe" personification of several operating systems by various amateur Japanese artists. The OS-tan are typically depicted as girls, with the OS-tan representative of Microsoft Windows operating systems usually depicted as sisters of varying ages.
For those that are curious, please take a look at this wiki!