| Some classify the northern dialects of Low German together with English and Frisian as the North Sea Germanic or Ingvaeonic languages. |
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| The related Low German has developed differently since Old Saxon times and has lost many Ingvaeonic characteristics. |
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| Changes in this period affected the Ingvaeonic languages, but not the more southerly Central and Upper German languages. |
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| This similarity was reinforced in the late Middle Ages by the Ingvaeonic sound shift, which affected Frisian and English, but the other West Germanic varieties hardly at all. |
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| There are also various differences in their phonological evolutions, Old Saxon being considered as an Ingvaeonic language whereas Old Dutch is an Istvaeonic language. |
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| The dialect of the Germanic people who remained in Scandinavia is not generally called Ingvaeonic, but is classified as North Germanic, which developed into Old Norse. |
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