Over at the Effectively Wild podcast group on Facebook, a hard-working soul manually put together a list of the longest last names in MLB history by position.
Using the Lahman Baseball Database, this is the list I came up with:
| POS | GAMES | NAME | LENGTH |
| 1B | 959 | Doug Mientkiewicz | 12 |
| 2B | 510 | Gene DeMontreville | 13 |
| SS | 649 | Bill Knickerbocker | 13 |
| 3B | 303 | Will Middlebrooks | 12 |
| C | 737 | Jarrod Saltalamacchia | 14 |
| OF | 948 | Todd Hollandsworth | 13 |
| OF | 14 | Austin Knickerbocker | 13 |
| OF | 2 | Lou Schiappacasse | 13 |
| P | 396 | Ken Raffensberger | 13 |
| P | 315 | Al Hollingsworth | 13 |
| P | 88 | Tim Spooneybarger | 13 |
| P | 84 | William VanLandingham | 13 |
| P | 36 | Bonnie Hollingsworth | 13 |
| P | 32 | Steve Wojciechowski | 13 |
| P | 26 | John Van Benschoten | 13 |
| P | 7 | Kirk Dressendorfer | 13 |
| P | 5 | Asher Wojciechowski | 13 |