St. John is known as the evangelist. There are two St. James the lesser and the greater. St. James the lesser is known as the lust and the greater is known as the elder.
St. Columcille, also known as St. Columba. He was from county Donegal.
As far as is known they were not related.
St George is the Patron Saint of England and he is known as St George.
Little is known about St. Valentine, including his family.
It appears to be St. Kitts in the Caribbean.
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This is not known.
No.
St. Mungo, also known as St. Kentigern, is said to be buried at the Glasgow Cathedral in Scotland. The cathedral, also known as St. Mungo's Cathedral, is dedicated to him and is believed to be his final resting place.
If you are referring to St. Nathaniel, also known as St. Bartholomew, he is thought to be from Cana in Galilee.
He was also known as the Apostle of Wales.