Byll \b(y)-ll\ as a boy's name is a variant of Bill (English). See for meaning of Byll.

The baby name Byll sounds like Bell, Bayly, Bail, Bala, Balu, Beal, Beall, Billy, Bly, Buell, Buhl, Buel, Poll, Pell, Pall, Bale and Bille. Other similar baby names are Bald, Berl, Burl, Coll, Dell, Gall, Gill, Hall, Hill, Kell, Kyle, Lyle, Mylo, Noll, Sill, Till, Ull and Will.