This is the funnel mark of LUSITANIA (ENI 04005670) seen at Hamburg on May 21, 2019.

The ship's website is www.ms-lusitania.de

According to the website the master (and owner?) of the ship is Mr. Thorsten Fröhlich. So I guess the logo is sporting his initials.

But I couldn't find the logo or the name of a related company on the website.