Hello
As much as i could understand you need only a name for your company (not the logo and other branding) that has something to do with the astrology.
I guess that the best idea is to write some of the name proposals here, so here is some ideas:
Zodiac Interior Design/Interiors
Constellation Interior Design/Interiors
Crystal Ball Projects
Libra Design Studio
Taurus Homes
Aquarius Design
Orion Interior Design