Frenkisch
Frenkisch is an a-posteriori constructed language. Its 8 source languages are English, Dutch, German, Danish, Norwegian, Swedish, French & Russian. It is an attempt to make a language that is a mixture of multiple modern Germanic languages. It is intended to look like a typical Germanic language in vocabulary and phonology. It also has significant Romance and Slavic influences. The approach in building it, is based on the Interlingua (IL) method but with a sample of mainly Germanic languages.
There are 5 source language units: 1 English; 2 Dutch; 3 German; 4 Danish, Norwegian & Swedish; 5 French & Russian. The 3 Scandinavian languages are treated as one source language unit. French and Russian are treated as secondary source languages - they count as a maximum of one source language unit.
Linguistic features (such as grammar, words or sounds) require the presence of cognates in at least 3 of the source language units. The forms of words are derived by regular evolution from etymological prototypes.