DC changed their Quicksilver's name to "Max Mercury" to get around issues with Marvel. I know Mattel had issues with several other DC characters doing DC Universe Classics. "Metamorpho" was trademarked for The Outer Space Men during the time, "Obsidian" was trademarked to Hasbro for a Transformer, "Mary Marvel" was released a "Mary Batson". They had the same issues with MOTUC with Flipshot, Double Trouble and Strong Arm. Marvel has issues with some of their characters, too, with Hasbro marking them as "Marvel's Ares", "Marvel's Scarecrow", etc.