There are 3 languages which are using this character. 200.859.000 people are speaking those languages.
Languages using the diacritic Ydieresis: Breton, French & Welsh.

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.notdef.nullCRspaceuni00A0A (A)B (B)C (C)D (D)E (E)F (F)G (G)H (H)I (I)J (J)K (K)L (L)M (M)N (N)O (O)P (P)Q (Q)R (R)S (S)T (T)U (U)V (V)W (W)X (X)Y (Y)Z (Z)a (a)b (b)c (c)d (d)e (e)f (f)g (g)h (h)i (i)j (j)k (k)l (l)m (m)n (n)o (o)p (p)q (q)r (r)s (s)t (t)u (u)v (v)w (w)x (x)y (y)z (z)Otilde (Õ)agrave (à)Egrave (È)aacute (á)Aacute (Á)acircumflex (â)OE (Œ)atilde (ã)Adieresis (Ä)adieresis (ä)Amacron (Ā)amacron (ā)Abreve (Ă)abreve (ă)Aring (Å)aring (å)Aringacute (Ǻ)aringacute (ǻ)Adotbelow (Ạ)adotbelow (ạ)Aogonek (Ą)aogonek (ą)AE (Æ)ae (æ)AEacute (Ǽ)aeacute (ǽ)Ccircumflex (Ĉ)ccircumflex (ĉ)Cdotaccent (Ċ)cdotaccent (ċ)Ccedilla (Ç)ccedilla (ç)Dcaron (Ď)dcaron (ď)Dcroat (Đ)yacute (ý)Thorn (Þ)Icircumflex (Î)egrave (è)Eacute (É)eacute (é)Edieresis (Ë)ecircumflex (ê)Etilde (Ẽ)etilde (ẽ)Ecaron (Ě)ecaron (ě)Iacute (Í)edieresis (ë)Emacron (Ē)emacron (ē)Ebreve (Ĕ)ebreve (ĕ)Edotaccent (Ė)edotaccent (ė)Edotbelow (Ẹ)edotbelow (ẹ)Eogonek (Ę)eogonek (ę)Gcircumflex (Ĝ)gcircumflex (ĝ)Gcaron (Ǧ)gcaron (ǧ)Cacute (Ć)cacute (ć)Gdotaccent (Ġ)gdotaccent (ġ)Gcommaaccent (Ģ)gcommaaccent (ģ)Hcircumflex (Ĥ)hcircumflex (ĥ)Hbar (Ħ)hbar (ħ)macron (¯)Ocircumflex (Ô)igrave (ì)Idieresis (Ï)iacute (í)Igrave (Ì)icircumflex (î)Itilde (Ĩ)itilde (ĩ)Oacute (Ó)idieresis (ï)Imacron (Ī)imacron (ī)Ibreve (Ĭ)ibreve (ĭ)Ccaron (Č)i.TRK (i)Idotbelow (Ị)idotbelow (ị)Iogonek (Į)iogonek (į)dotlessj (ȷ)Jcircumflex (Ĵ)jcircumflex (ĵ)Kcommaaccent (Ķ)kcommaaccent (ķ)kgreenlandic (ĸ)Lacute (Ĺ)lacute (ĺ)Lcaron (Ľ)lcaron (ľ)Lcommaaccent (Ļ)lcommaaccent (ļ)scaron (š)Zcaron (Ž)Ldot (Ŀ)ldot (ŀ)Nacute (Ń)nacute (ń)Ntilde (Ñ)ntilde (ñ)Ncaron (Ň)ncaron (ň)Ncommaaccent (Ņ)ncommaaccent (ņ)Nhookleft (Ɲ)nhookleft (ɲ)Eng (Ŋ)eng (ŋ)napostrophe (ʼn)Ugrave (Ù)ograve (ò)Ograve (Ò)oacute (ó)Uacute (Ú)ocircumflex (ô)oe (œ)otilde (õ)Odieresis (Ö)odieresis (ö)Omacron (Ō)omacron (ō)Obreve (Ŏ)obreve (ŏ)Ohungarumlaut (Ő)ohungarumlaut (ő)Odotbelow (Ọ)odotbelow (ọ)Oogonek (Ǫ)oogonek (ǫ)Oslash (Ø)oslash (ø)Oslashacute (Ǿ)oslashacute (ǿ)endash (–)emdash (—)Racute (Ŕ)racute (ŕ)Rcaron (Ř)rcaron (ř)Rcommaaccent (Ŗ)rcommaaccent (ŗ)Sacute (Ś)sacute (ś)Scircumflex (Ŝ)scircumflex (ŝ)zcaron (ž)brokenbar (¦)ccaron (č)Scommaaccent (Ș)scommaaccent (ș)uni1E9E (ẞ)germandbls (ß)germandbls.alt (ß)Tcaron (Ť)tcaron (ť)uni0162 (Ţ)uni0163 (ţ)uni021A (Ț)uni021B (ț)Tbar (Ŧ)tbar (ŧ)multiply (×)onesuperior (¹)tilde (˜)ugrave (ù)dotlessi (ı)uacute (ú)circumflex (ˆ)ucircumflex (û)Utilde (Ũ)utilde (ũ)Udieresis (Ü)udieresis (ü)Umacron (Ū)umacron (ū)Ubreve (Ŭ)ubreve (ŭ)Uring (Ů)uring (ů)Uhungarumlaut (Ű)uhungarumlaut (ű)Udotbelow (Ụ)udotbelow (ụ)Uogonek (Ų)uogonek (ų)Wgrave (Ẁ)wgrave (ẁ)Wacute (Ẃ)wacute (ẃ)Wcircumflex (Ŵ)wcircumflex (ŵ)Wdieresis (Ẅ)wdieresis (ẅ)Ygrave (Ỳ)ygrave (ỳ)thorn (þ)minus (−)Ycircumflex (Ŷ)ycircumflex (ŷ)Ytilde (Ỹ)ytilde (ỹ)currency (¤)fraction (⁄)Ymacron (Ȳ)ymacron (ȳ)Zacute (Ź)zacute (ź)Eth (Ð)eth (ð)Zdotaccent (Ż)zdotaccent (ż)IJ (IJ)ij (ij)IJacute ()ijacute ()Schwa (Ə)schwa (ə)f_f (ff)daggerdbl (‡)f_i (fi)periodcentered (·)f_l (fl)f_ij ()f_f_i (ffi)f_f_l (ffl)f_f_ij ()ampersand (&)at (@)asterisk (*)copyright (©)registered (®)trademark (™)asciicircum (^)asciitilde (~)grave (`)gravecapacute (´)acutecapbreve (˘)circumflexcapScaron (Š)caroncapcaronaltdotaccent (˙)tildecapdieresis (¨)dieresiscapring (˚)macroncapuni02C9 (ˉ)cedilla (¸)brevecapogonek (˛)ringcapLslash (Ł)hungarumlautcaphungarumlaut (˝)dotaccentcapcaron (ˇ)dotbelowcomb (̣)lslash (ł)commaaccent (̦)commaaccentaltuni00AD (­)hyphen (-)quotedblleft (“)quotedblright (”)underscore (_)period (.)comma (,)colon (:)semicolon (;)exclam (!)exclamdown (¡)question (?)questiondown (¿)Agrave (À)quotedblbase („)uni2219 (∙)bullet (•)slash (/)backslash (\)bar (|)Yacute (Ý)parenleft (()parenright ())bracketleft ([)bracketright (])braceleft ({)braceright (})quotesingle (')quotedbl (")divide (÷)lozenge (◊)quoteleft (‘)quoteright (’)perthousand (‰)Acircumflex (Â)fi (fi)fl (fl)guillemotright (»)ellipsis (…)paragraph (¶)uniF8FF ()numbersign (#)zero (0)one (1)two (2)three (3)four (4)five (5)six (6)seven (7)eight (8)nine (9)zeroslashguilsinglleft (‹)uni2215 (∕)gbreve (ğ)Gbreve (Ğ)Scedilla (Ş)degree (°)percent (%)Ecircumflex (Ê)plus (+)twosuperior (²)plusminus (±)equal (=)notequal (≠)approxequal (≈)threesuperior (³)less (<)greater (>)lessequal (≤)greaterequal (≥)ydieresis (ÿ)logicalnot (¬)dagger (†)quotesinglbase (‚)section (§)Euro (€)guilsinglright (›)dollar ($)cent (¢)florin (ƒ)sterling (£)yen (¥)onehalf (½)onequarter (¼)threequarters (¾)ordfeminine (ª)ordmasculine (º)uni2116 (№)guillemotleft («)Deltagreek (Δ)Omega (Ω)Omegagreek (Ω)mu (µ)mugreek (μ)pi (π)uni2113 (ℓ)estimated (℮)infinity (∞)partialdiff (∂)integral (∫)radical (√)summation (∑)product (∏)Ydieresis (Ÿ)