The English diminutives Cys and Cyssot are witnessed in 1379 in the relational bynames Cyssoñ (WRYPT1 p. 131) and Cyssotsoñ (WRYPT1 p. 133).

Belgium

Dutch

● 1597x1598 Cecilia BoonenGes p. 373, Cecilie ibid. p. 324

Brabant

Latin

● 1312 Cecilia (nom) JeanIII p. 28

England

Latin

● 1185x1186 Cecilia (nom) PR-XXXVI p. 18; 1189 Cecilia (nom) GASurv p. 178; 1222 Cecilia (nom) StPaulDom p. 4, Sicilia (nom) ibid. p. 45; 1240 Cecilia (nom) ibid. p. 119; 1279–80 Cecilia (nom) WaHR-SK p. 36, Cecilie (gen) ibid. p. 27; 1296 Cecilia (nom) RCS-1 p. 95a, Cecilie (gen) ibid. p. 95a; 1319 Cecilia (nom) PSS-CXIV 5a, Ceciliam (acc) ibid. 5b, Cecilie (gen) ibid. 5a; 1322 Cecilia (nom) ibid. 7; 1326 Cecilie (gen) ibid. 13; 1340xc1450 Cecilia (nom) CovGuild-1 p. 6, Cecilicia (nom) ibid. p. 36, Cesilia (nom) ibid. p. 66, Cicilia (nom) ibid. p. 40; 1377 Cecilia (nom) FenPT-2 p. 4; 1379 Cecilia (nom) WRYPT1 p. 2, Cicelia (nom) ibid. p. 15, Cicilia (nom) ibid. p. 15, Ciscilia (nom) ibid. p. 14, Cissilia (nom) ibid. p. 16; 1381 Ceceli (nom) FenPT-2 p. 10, Cecilia (nom) ibid. p. 9, Suffolk1381 p. 69, Cicilla (nom) FenPT-2 p. 6, Cissilia (nom) Suffolk1381 p. 73; 1408 Cecilia (nom) GCCYork p.12; 1431 Ceciliæ (dat) WillsInv æ; 1440 Ciciliæ (dat) ibid. LI; 1555 Cecilia (nom) StMartF p. 58; 1559 Cecilia (nom) ibid. p. 59; 1560 Cecilia (nom) ibid. p. 60; 1565 Cicilia (nom) RegSoAMar p. 4

◑ 1379 Cissota (nom) WRYPT1 p. 16, Cyssot (nom) ibid. p. 7, Sissot' (nom) ibid. p. 16

Middle English

● 1424–25 Cecile EEW p. 56; 1425 Cecile ibid. p. 63; 1426 Cisily ibid. p. 70; 1436 Cicile ibid. p. 106

Early Modern English

● 1530 Cecile LIWill-III p. 31, Cecill ibid. p. 79, Cecily ibid. p. 57, Secily ibid. p. 10; 1540 Syslyth BarnstapleBap p. 1; 1543 Cisley StAnthonlin p. 4; 1544 Syslyeth BarnstapleBap p. 4; 1545 Ciseley BEmar-vol1 p. 3; 1546 Syslyth BarnstapleBap p. 5; 1548 Sisly StAnthonlin p. 6; 1549 Cyseley BEmar-vol1 p. 3, Sisly StAnthonlin p. 8; 1555 Syslyth BarnstapleBap p. 9; 1559 Ciceli bruton1 p. 30, Cicelie ibid. p. 30; 1560 Cicyly SaxhamSf p. 56; 1562 Sisley StAnthonlin p. 14; 1569 Cicely BEmar-vol2 p. 95, Sicilia RegSoAMar p. 6; 1570 Cicely bruton1 p. 5; 1571 Cicely BUmar-vol9 p. 5; 1574 Sicelye RegSoAMar p. 7; 1578 Sisley OrpingtonKe p. 5; 1579 Sisley ibid. p. 5; 1580 Cicelie bruton1 p. 44; 1581? Sisilye COmar-vol5 p. 127; 1584 Sisly DEmar-vol2 p. 10; 1585/6 Cislie BEmar-vol1 p. 12; 1586 Sisly DEmar-vol2 p. 12; 1587 Sicely RegSoAMar p. 13; 1588 Sessellye Bar-in-El p. 14; 1589 Sicely RegSoAMar p. 14, Sisily COmar-vol5 p. 128, Sisley WAmar-1 p. 132; 1590 Sisly DEmar-vol2 p. 22, StAnthonlin p. 34; 1591 Cysly ibid. p. 35; 1592 Cicely BUmar-vol9 p. 8; 1595 Cicelie bruton1 p. 54, Sysle BUmar-vol1 p. 27; 1596 Cicely DEmar-vol2 p. 34, Cislye HAmar-vol9 p. 3, Sicelea BUmar-vol2 p. 66; 1597 Cicelie bruton1 p. 11, Sisley DEmar-vol2 p. 36; 1598 Cicely BUmar-vol9 p. 10, Sicely RegSoAMar p. 19, Sisley COmar-vol2 p. 50, Sisly DEmar-vol2 p. 39, Sislye ibid. p. 37; 1599 Cicilie bruton1 p. 57, Seccely BEmar-vol2 p. 4

◑ 1563 Ciceletam BUmar-vol2 p. 60; 1569 Cicelet ibid. p. 61

Walloon

● 1583/4 Cicille RWC p. 8

France

Latin

● 1180 Cecilie (gen) RotScaNor p. 3

Middle French

● 1564 Cécille RegPCC-1 p. 65; 1565 Cecille ibid. p. 171; 1566 Cicile ibid. p. 267; 1587 Cecille RTFProvins 11

Italy

Latin

● 1348 Cecilia (nom) INP 26; 1450 Ciciliam (acc) VitAs2 VIII, Cicilie (gen) ibid. VIII; 1527 Cicilia (nom) Rome1527 p. 88

Italian

● 1513x1521 Cecilia LeoX p. 30

Spain

Catalan

● 1510 Sicilia valencia1510 3214

Sweden

Latin

● 1350 Cecilie (dat) SDHK no. 6037

Early Modern Swedish

● 1543 Cicell (nom) Audén1980 p. 162

Switzerland

Latin

● 14thCx1478 Cicillia (nom) Ob-SPVn (54)

Wales

Early Modern English

● 1571 Cissill RegLlantrithyd p. 61; 1577 Cissill ibid. p. 61; 1591 Cissill ibid. p. 35; 1592 Cissill ibid. p. 34; 1594 Cissill ibid. p. 62; 1597 Cissill ibid. p. 1; 1598 Cissill ibid. p. 1; 1599 Cissill ibid. p. 1