[16th ave.]

yeah, i agree. do his last name so both kiddos have the same one. also the last name and any name can be changed later on for whatever reason.

in my own experience:
my sister gave her oldest son her last name since his daddy would not be around and had denied the child anyway (her first kiddo). she gave the other two kids their dad's name (her son's step-father's) and never had much--if any--trouble over the different names. so it worked out fine. her son was eventually adopted by his step-dad and (i think but not sure) he changed his name after the adoption papers were signed even though the name didn't have to be changed. that worked out pretty well for her.
my own girls have their daddy's last name and mine. he wanted them to have his but i wanted to make sure there were no problems if we ever split up or something happened to one of us or whatever (the whatever is hard too hard to explain, ya had to be here when it all happened.) so my girls have 5 names: E.A.L. R-G and C.A.L. R-G. long names but different and not somehting you see very often except mostly in families with alot of traditions carried down.

i hope your road isn't too hard to travel. feel free to stop by here and offer any advice ya have and give any and chatter with everyone.