help what surname do i use

[hayley2u]

hi i really need advice on surnames.I am xpecting my first daughter in next 8 weeks and dont know who s surmame to use ine or my partners. we have decided to call our baby lucy short for lucinda.i already have a son fro previous relationship he has my surname lawrenson as does my partner his son has his surname. so what should i do
lucinda lawrenson
or
lucinda sunderland
or mixture of both
lucinda sunderland lawrenson.
please help dont no what to do.
we are not married therfore members of my family are teling e to kep m name then change it if married to his

i'd keep your name and if you do get married you can always change it

thanks everyone
yer think might just keep my name that way were all the same as dont want any of my kids to be different. also if i was to give lucy my partners surname my son who has just turned 5 may have some difficulties understanding. so if i keep my name and we do get maried itl be more special as the children will be gaining his name too.