Sylvia, the nearest was probably the Ramshorn kirkyard but that was reserved for the city's merchants, across the Clyde is Gorbals parish so I think the Cathedral would be the best bet for Glasgow & the Barony parishes. There is a burial ground at St Andrew's on the Green which is just east of St Enoch's but that was for Episcopalians.
Dunno if St Enoch's had a kirkyard of its own, the church has completely disappeared.
Skoosh.