From BiblePortal Wikipedia

Hastings' Dictionary of the Bible [1]

Gephyrun . A city captured by Judas Maccabæus ( 2Ma 12:13; AV [Note: Authorized Version.] ‘he went also about to make a bridge to a certain city,’ RV [Note: Revised Version.] ‘he also fell upon a certain city Gephyrun’). It is possible that the Greek text is corrupt (see RVm [Note: Revised Version margin.] ).

International Standard Bible Encyclopedia [2]

ge - fı̄´run ( Γεφυρούν , Gephuroún ): In   2 Maccabees 12:13 , referring to the capture by Judas of a stronghold East of Jordan, the Revised Version (British and American) reads, "And he also fell upon a certain city Gephyrun,... it was named Gaspin." There appears to be some confusion in the text. There is nothing to indicate the relation between the two names. the King James Version renders, "He went also about to make a bridge." The name of the city in Josephus ( Ant. , Xii , viii, 5) is Ephron (which see).