Webster's Revised Unabridged Dictionary · 1913

Christen

Christen , transitive verb

[Anglo-Saxon cristnian to make a Christian, from cristen a Christian.]

1.
To baptize and give a Christian name to.
2.
To give a name; to denominate.
Christen the thing what you will. — Bp. Burnet
3.
To Christianize. [Obsolete] — Jer. Taylor
4.
To use for the first time. [Colloquial]