Wow.  Here’s the problem with this little piece of fiction.  The Gospel of Philip was not written in Aramaic.  The only surviving manuscript is written in Coptic.  It is widely believed that the Coptic version is translation of an original Greek work. The same equation of “companion” and “spouse” does not apply in Coptic or Greek.  The Coptic word “KOINONOC” is clearly derived from the Greek word koinonos.  This Greek word could assume a wide range of meanings.  Basically, it denotes a person engaged in “fellowship or sharing with someone or in something.”  What a koinonos can share with his or her parner can take many forms, ranging from a common enterprise or experience to a shared business.  In the Bible, for example, koinonos can be used to denote a marriage partner (Mal 2:14), a companion in faith (Philem. 17), a co-worker in proclaiming the gospel (2 Cor 8:23), or a business associate (Luke 5:10).  Interestingly, all of the New Testament uses are of non-marital relationships; the only text that uses the term to denote a marital relationship is from the Old Testament.  According to the best scholarly work on this question, “the decisive argument against the assumption that the word KOINONOC is ‘wife’ is the fact that in all the other instances where the Gospel of Philip speaks about someone’s wife it uses the usual word CSIME (65:20; 70:19; 76:7; 82:1).  The word KOINONOC is clearly reserved for a more specific usage in the writing” (Antti Marjanen, The Woman Jesus Loved: Mary Magdalene in the Nag Hammadi Library and Related Documents, 151-152).  This book might profitably be retitled The Book Dan Brown Should Have Read. 

Even if one could reliably translate back from one language to another (which is difficult and highly speculative), one would not be translating this text back into Aramaic.  The only way Brown’s argument makes sense is if one assumes that the gospel of Philip dates from the time of Jesus (it doesn’t) and that it must then have originally been written in Aramaic.  But this is a faulty assumption, and no evidence can be marshaled in support of it.