Geron
Geron meaning: Guards, guardian.
Geron origin: French
Geron gender: Male

Geronimo
Geronimo meaning: Sacred name. Variant of the saint's name Jerome. 19th Century American Indian Geronimo was one of the last of the Apache warrior chiefs.
Geronimo origin: Greek
Geronimo gender: Male

Gerontius
Gerontius meaning: A Latin version of the Greek 'geron' meaning old.
Gerontius origin: Latin
Gerontius gender: Male