Revd Rachel Simpson launched the Facebook appeal seeking mourners after getting the funeral details of Harold Morgan and seeing no relatives.
The appeal saw dozens of locals pay their last respects to the Welsh Guardsman on Thursday at St Tathan Church in St Athan.
Her Facebook post said: "Unfortunately there's been some difficulty tracing next of kin or knowing who his friends were, or if they're still in St Athan. If you did know Harold or have any more information, please get in touch or come along to his funeral on Thursday. Thank you."
According to Wales Online, Oxford-born Mr Morgan, whose family roots are in the Carmarthenshire area, had lived in a care home in Barry for around 14 years after leaving his previous home in the seaside town.
He had been a book-keeper and railway signalman who did his National Service with the Welsh Guards in Egypt.
