Gerontius \ge-ron-tius, ger(o)-ntius\ as a boy's name is of Latin origin, and the meaning of Gerontius is "old man". The root of "geriatic" and "gerontology".

Baby names that sound like Gerontius are Gerant, Geraint, Jerant, Grant, Grantley, Grantham and Grantly. Another similar baby name is Jeronimus.