There are several reputable custom logo design companies, and the choice depends on your specific needs, budget, and design preferences. Here are a few well-regarded custom logo design services:

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1. **99designs**: 99designs is a design platform that connects you with professional designers. You can run design contests, where multiple designers submit logo concepts for you to choose from.

2. **Crowdspring**: Crowdspring is another design crowdsourcing platform that offers logo design services. You can create a project, and designers will submit logo ideas based on your brief.

3. **Designhill**: Designhill allows you to launch logo design contests or work directly with a designer to create a custom logo. They also offer other design services.

4. **Looka (formerly Logojoy)**: Looka uses AI to help you generate logo concepts based on your input. You can customize and finalize your logo design through their platform.

5. **Hire a Professional Designer**: If you prefer a one-on-one approach, consider hiring a professional graphic designer. You can find experienced designers on platforms like Upwork or Freelancer or through local design agencies.

6. **Fiverr**: Fiverr is a freelance marketplace where you can browse through individual designers’ profiles and hire someone who specializes in logo design.

When choosing a custom logo design company or designer, it’s important to review their portfolios, read reviews, and consider your budget. Each of these services has its own strengths and may be more suitable for specific projects or design preferences.