Take it to any engraver who does trophies.It is easy to do on the pantograph.Fancy fonts,upper/lower case,variable size,etc.-no problem.It won't cost more than a couple of dollars.Don't try to stamp it in,you will never get it right,and the mistakes are permanent.If you were set up for that size of etching you wouldn't have asked,so I'll assume you don't have the equipment for fancy etching.Engraving is the standard for this kind of marking.I do it every week.I also mark custom knives,"Made for JOHN DOE",or whatever is appropriate,by engraving.
Stacy