Michael Myers - Luckily this guy was born in Vicksburg, Mississippi, and not Haddonfield, Illinois. Still, Myers piled up 212 tackles and 15.5 career sacks over 10 seasons (1998-2007) with the Cowboys, Browns, Broncos, and Bengals. He also forced four fumbles and had an interception, which is one more NFL interception than Wedge, Speedgeek, and I have combined!
Boo Williams - Although his name is scary, Williams himself probably did not frighten opposing defenses as as much as he could have. Over four seasons with New Orleans (2001-04), Williams caught 107 passes for 1,143 yards and 12 scores. A knee injury ended his career, although he signed with the Arena League's Kansas City Brigade in 2007. After that he sort of... vanished. (Sorry, I had to.)
Candy Miller - Candy is basically the best thing about Halloween, and Miller might have celebrated with a Hershey Bar after scoring his only career touchdown in 1922. The right tackle (how did he score a touchdown?) played two seasons (1922-23) with the Racine Legion and the Canton Bulldogs.
Dick Witcher - Witcher played eight seasons (1966-73) with the 49ers, catching 172 passes for 2,359 yards and 14 touchdowns. It's just a shame he never had a chance to team up with Harvey Salem, a tackle who played with Houston, Detroit, Denver, and Green Bay from 1983-92.
Death Halladay - The man's name was Death, but he surely must have looked alive while scoring his two career touchdowns. Halladay played for the Racine Legion in 1923-24, meaning he was on the same field as Candy Miller for one season.
Dave Casper - He may share his name with a friendly ghost, but Casper was mean enough to accumulate 5,216 receiving yards and 52 touchdowns on 372 career receptions. A tight end with Oakland, Houston, Minnesota, and Los Angeles, he played from 1974-84 and was All-NFL numerous times.
Cody Grimm - Don't fear the Reaper, and you really don't need to fear Grimm too much either. In three years with Tampa Bay (2010-12), he managed just two interceptions in 12 starts. He did bring one back for a touchdown in 2010.
The following players receive honorable mention for having Halloween-, horror-, or autumn-related names: Mike Scarry, Kordell "Slash" Stewart, LaRod Stephens-Howling, Webster Slaughter, Spider Lockhart, Dick Wolf, Jim Apple, Ryan Leaf, Michael Hay, Vlad Ducasse.
Source: Pro Football Reference