giving a Christian name at baptism
"The entire family gathered for the christening to officially give baby Emma her Christian name during the church service."
The Christian sacrament at which someone, usually a child, is baptized and given a Christian name.
"The entire family gathered for baby Leo's christening to celebrate his baptism and welcome him into the church."
present participle of christen
"The baby's hands were so slippery that I slipped while holding them during their christening."