At the risk of going from the Frying Pan into the Fire here goes.
DO Re Me is called a solfege. It is usually used for singing ear training. For English and Germanic countries we use CDEFGABC.
From Wikipedia under solfege:
In music, solfège (pronounced /ˈsoʊlfɛʒ/, also called solfeggio, sol-fa, or solfa) is a pedagogical solmization technique for the teaching of sight-singing in which each note of the score is sung to a special syllable, called a solfège syllable (or "sol-fa syllable"). The seven syllables normally used for this practice in English-speaking countries are: do, re, mi, fa, sol, la, and ti (with a chromatic scale of ascending di, ri, fi, si, li and descending te, le, se, me, ra).
Traditionally, solfège is taught in a series of exercises of gradually increasing difficulty, each of which is also known as a "solfège". By extension, the word "solfège" may be used of an instrumental étude. Solfège is taught at many conservatories of music. For example, in the 1960s The Juilliard School hired the late, well-known solfège expert Renee Longy to teach solfège to many instrumentalists and singers.
THIS IS THE IMPORTANT PART.....In the Romance countries of Europe and Latin America, these seven syllables have come to be used to name the notes of the scale, instead of the letters C, D, E, F, G, A and B. (For example, they would say, "Beethoven's ninth symphony is in Re minor".) In Germanic countries, the letters are used for this purpose, and the solfège syllables are encountered only for their use in sight-singing and ear training. (They would say, "Beethoven's ninth symphony is in D minor".) Japan uses traditional kana order (iroha) to correspond to Anglo-American note names.
For all the gory details see:
en.wikipedia.org/wiki/Solf%C3%A8ge
I beleive that you would find the CDEFGABC in Germany and Great Britian but the Do RE ME in Spain, Portugal, etc. I could go on but I think this should do it.
Sleep tight Sylvia. Hope this helps. Be kind in your reply. Kudos greatfully accepted.