The "J" consonant leads to many interesting things because of how many pronounciations it has. It can be an english "J" or the softer latin "J" (identical to an I) or an in between Y which could be between an english J and SH. In current spanish, however, the J is pronounced as the "voiceless velar fricative"[1] (a very strong H?), so whilst the name started sounding like "Iacobo", it's now a very firm HHakobo.