Ever heard of these terms:
Definitely all of them relate to a certain phobia but the common thread running across the three words is No 13 which is considered to be inauspicious in the western world. It derives its negativity from the Apollo 13 mission.
Triskaidekaphobia refers to "Fear of No 13"
Friggatriskaidekaphobia and Paraskevidekatriaphobia refer to "Fear of Friday the 13"
2012 is one such year where we have three Fridays coming on 13th.