There is an 81-year-old Alexander McIntyre, born Morvern, in Alloa in 1901. He's 74 in 1891, 62 in 1881, 53 in 1871, 44 in 1861 and 34 in 1851. So he was born in Morvern between 1816 and 1820, but he's obviously not yours as he had settled in Clackmannanshire by 1851.