pal is another word borrowed from Romani: phral "brother, mate", related to Sanksrit भ्रातृ bhrātṛ "brother". The Proto-Indo-European root is *bʰrāter- "brother".
*bʰrāter became English brother, Latin frāter. And also Dutch broeder, which was altered to boel "lover (of either sex); brother". This is a possible source of bully according to both the AHD and the OED. The earliest meaning of bully was "sweetheart, darling".