| Family | L1 | L2 | Language | % Correct |
|---|---|---|---|---|
| Germanic | 63 mil | 197 mil | English | 99%
|
| Romance | 71 mil | 64 mil | French | 99%
|
| Germanic | 97 mil | 63 mil | German | 99%
|
| Slavic | 106 mil | 54 mil | Russian | 99%
|
| Romance | 65 mil | 17 mil | Italian | 98%
|
| Romance | 38 mil | 38 mil | Spanish | 98%
|
| Germanic | 11 mil | 2.1 mil | Swedish | 98%
|
| Hellenic | 11 mil | - | Greek | 97%
|
| Romance | 10 mil | - | Portuguese | 97%
|
| Slavic | 38 mil | - | Polish | 96%
|
| Turkic | 12 mil | - | Turkish | 96%
|
| Slavic | 32 mil | - | Ukrainian | 95%
|
| Germanic | 22 mil | - | Dutch | 94%
|
| Uralic | 5.4 mil | - | Finnish | 94%
|
| Romance | 24 mil | 4.0 mil | Romanian | 94%
|
| Slavic | 10 mil | - | Czech | 93%
|
| Germanic | 5.5 mil | - | Danish | 93%
|
| Baltic | 1.7 mil | - | Latvian | 93%
|
| Slavic | 21 mil | - | Serbo-Croatian | 93%
|
| Uralic | 1.1 mil | - | Estonian | 92%
|
| Baltic | 3.0 mil | - | Lithuanian | 92%
|
| Germanic | 5.2 mil | - | Norwegian | 92%
|
| Other Indo-European | 5.8 mil | - | Albanian | 91%
|
| Slavic | 7.8 mil | - | Bulgarian | 91%
|
| Uralic | 13 mil | - | Hungarian | 91%
|
| Slavic | 5.2 mil | - | Slovak | 91%
|
| Germanic | 330 k | - | Icelandic | 89%
|
| Celtic | 240 k | 1.0 mil | Irish | 89%
|
| Slavic | 2.1 mil | - | Slovene | 88%
|
| Slavic | 1.4 mil | - | Macedonian | 85%
|
| Celtic | 57 k | - | Scottish Gaelic | 85%
|
| Celtic | 562 k | 188 k | Welsh | 84%
|
| Slavic | 3.3 mil | - | Belarusian | 79%
|
| Romance | 4.0 mil | 6.0 mil | Catalan | 77%
|
| Language isolate | 750 k | - | Basque | 64%
|
| Germanic | 336 k | 50 k | Luxembourgish | 61%
|
| Romance | 30 k | 95 k | Corsican | 56%
|
| Romance | 1.3 mil | - | Sardinian | 56%
|
| Semitic | 520 k | - | Maltese | 47%
|
| Romance | 44 k | - | Romansh | 46%
|
| Romance | 2.4 mil | - | Galician | 45%
|
| Uralic | 23 k | - | Sami | 45%
|
| Celtic | 557 | - | Cornish | 41%
|
| Germanic | 66 k | - | Faroese | 35%
|
| Germanic | 3.5 k | - | North Frisian | 35%
|
| Germanic | 470 k | - | West Frisian | 35%
|
| Turkic | 4.3 mil | - | Tatar | 32%
|
| Northeast Caucasian | 1.4 mil | - | Chechen | 30%
|
| Turkic | 480 k | - | Crimean Tatar | 30%
|
| Celtic | 230 | 2.0 k | Manx | 26%
|
| Indo-Iranian | 597 k | - | Ossetian | 26%
|
| Slavic | 70 k | - | Rusyn | 17%
|
| Slavic | 20 k | - | Sorbian | 17%
|
| Uralic | 500 k | - | Hill/Meadow Mari | 15%
|
| Northwest Caucasian | 117 k | - | Adyghe | 14%
|
| Slavic | 50 k | - | Kashubian | 14%
|
| Turkic | 140 k | - | Gagauz | 12%
|
| Mongolic | 80 k | - | Kalmyk | 12%
|
| Turkic | 1.2 mil | - | Bashkir | 11%
|
| Turkic | 1.1 mil | - | Chuvash | 11%
|
| Northeast Caucasian | 300 k | - | Ingush | 11%
|
| Romance | 41 k | - | Ladin | 11%
|
| Uralic | 340 k | - | Udmurt | 10%
|
| Uralic | 220 k | - | Komi-Zyrian | 9%
|
| Romance | 15 k | - | Mirandese | 9%
|
| Romance | 1.9 k | 900 | Jèrriais | 7%
|
| Northwest Caucasian | 530 k | - | Kabardian | 7%
|
| Turkic | 300 k | - | Karachay-Balkar | 7%
|
| Romance | 200 | - | Guernésiais | 6%
|
| Uralic | 120 k | - | Erzya | 5%
|
| Uralic | 2.0 k | - | Moksha | 5%
|
| Turkic | 87 k | - | Nogai | 5%
|
| Northwest Caucasian | 49 k | - | Abaza | 4%
|