Pronounced ter-eh-SHAY, but with the "sh" said while the tip of the tongue is close to the roof of the mouth.Taken from http://en.wikibooks.org/wiki/Basque/Pronunciation :"'S' is probably the trickiest sound of all. It is not like the English 's', but rather like the one used in Castillian Spanish. It sort of sounds like English 'sh', but is much softer. In effect, it is produced by putting the tip of your tongue at the back of your top front teeth when saying 's'. It takes a bit of practice."
― Anonymous User 10/14/2011
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This name is also rather common in Norway, spelt with or without h. [noted -ed]
Very common in Sweden (much more than Teresa, Teresia etc), with a boat load of different spellings, such as: Therese, Therése, Terese, Theres, Thérese, Theresé, Therés. You never know how a person named that wants it written. Tessan is a common nickname.