Glimmer

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late Middle English: probably of Scandinavian origin; related to Swedish glimra and Danish glimre .

wiktionary

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From Middle English glimeren, glemeren(“to glimmer”), equivalent to glim(“to shine”) +‎ -er(frequentative suffix). Cognate with German Low German glimmern(“to glimmer”), German glimmern(“to glimmer”), Danish glimre(“to glimmer”), Swedish glimra(“to glimmer”).

etymonline

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glimmer (v.)

late 14c., "to shine brightly;" early 15c., "to shine dimly," perhaps from or related to Middle Dutch glimmen, Middle Low German glimmern, from an extended (frequentative?) form of Proto-Germanic *glim-, which also is the base of Old English glæm "brightness" (see gleam (n.)). Sense shifted 15c. to "shine faintly." Compare Dutch glimmeren, German glimmeren "to shine dimly." Related: Glimmered; glimmering.

glimmer (n.)

1580s, "a faint, wavering light," from glimmer (v.).